Abstract
Railway stations function as nodes in transport networks and places in an urban environment. They have accessibility and environmental impacts, which contribute to property value. The literature on the effects of railway stations on property value is mixed in its finding in respect to the impact magnitude and direction, ranging from a negative to an insignificant or a positive impact. This paper attempts to explain the variation in the findings by metaanalytical procedures. Generally the variations are attributed to the nature of data, particular spatial characteristics, temporal effects and methodology. Railway station proximity is addressed from two spatial considerations: a local station effect measuring the effect for properties with in 1/4 mile range and a global station effect measuring the effect of coming 250 m closer to the station. We find that the effect of railway stations on commercial property value mainly takes place at short distances. Commercial properties within 1/4 mile rang are 12.2% more expensive than residential properties. Where the price gap between the railway station zone and the rest is about 4.2% for the average residence, it is about 16.4% for the average commercial property. At longer distances the effect on residential property values dominate. We find that for every 250 m a residence is located closer to a station its price is 2.3% higher than commercial properties. Commuter railway stations have a consistently higher positive impact on the property value compared to light and heavy railway/Metro stations. The inclusion of other accessibility variables (such as highways) in the models reduces the level of reported railway station impact.
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Introduction
Location choice is a frequently discussed topic in urban economics. These discussions can be normative or descriptive in nature. Thus, in the literature we find two approaches to urban location analysis. The first set of studies addresses the issue of optimal location conditional to a given set of constraints (Fujita 1989). The second set of studies is devoted to explaining the character (value) of a property at a given location. However, the issue of identifying the factors that affect property values is common to both sets of approaches. Our discussion will basically address studies of the latter category, focusing on the relationship of property values and railway stations.
In the context of this paper, property means an estate ranging from a vacant piece of land to an area occupied by all sorts of buildings: residential, commercial, industrial etc. (Brigham 1965). Several studies have tried to address the discussions on property value. There is a general consensus among most authors in categorizing the factors affecting property values as physical, environmental and accessibility factors (Fujita 1989; Bowes and Ihlanfeldt 2001). However, some authors have included historical factors and land use patterns into their analysis (Brigham 1965). Numerous detailed lists of features can be identified within each of these categories. As to the relevance of the factors to the analysis, the detailed list can differ from one place to another and thereby from study to study.
Accessibility as provided by different modes of transportation and railway in particular, as a factor affecting property value, has also received some attention in the literature. The most common way of addressing the railway accessibility was by including the proximity factor in the analysis. This paper discusses the results of studies which have addressed the effect of railway stations on property value. The paper has two parts, a qualitative review and a quantitative analysis. The first part of the paper surveys studies on the effect of railway station proximity on property value. In the second part, meta analytical analysis is applied to systematically explain the variation in the findings on the impact of railway station proximity on property value across studies. Thus, in subsequent sections, we discuss the theoretical foundation of the studies, presenting and comparing the empirical results of the various studies conducted. In addition to the reviewing of studies conducted in the area, we make a quantitative analysis of the results of the studies, using metaanalysis to explain the differences in the results.
Literature Review: Theories and Findings
Most land value theories have their root in the work of Von Thünen (1863), who tried to explain variations in farmland values. According to Von Thünen, accessibility to the market place explains the value difference of farmlands for agricultural lands having similar fertility. In subsequent studies, economists like Alonso and Muth refined this line of reasoning into a bidrent analysis (Alonso 1964; Muth 1969). The basic idea behind the bidrent model is that every agent is prepared to pay a certain amount of money, depending on the location of the land. This leads to a rent gradient that declines with distance from the central business district (CBD) for sites that yield equal utility. Thus, far in the analyses, the dominant factor explaining the difference between land (property) values was the accessibility as measured by the distance to the CBD and the associated transportation costs. The physical characteristics of the land (fertility in the case of Thünen) were assumed given.
Thus, the basic theory on real estate prices can be put forward as follows: as a location becomes more attractive, due to certain characteristics, demand increases and thus the bidding process pushes prices up. In most cases CBDs are the centres of many activities. Therefore, closeness to the CBD is considered as an attractive quality that increases property prices. However, investments in transport infrastructure reduce this demand friction around the CBD to some degree (Fejarang 1994) by attracting households to settle around the stations. Properties close to the investment area (railway stations) enjoy benefits from transportation time and cost saving as a result of the investment. It may be expected that a price curve will have a negative slope; when we move away from the station, prices decrease.
The introduction of the hedonic pricing methodology (Rosen 1974) led to an easier way of attributing effects on property value to features comprising the properties. Thus, we observe the integration of physical, accessibility and environmental characteristics of properties in models trying to explain the difference in property values. Accessibility remains an important feature for urban properties. However, earlier attempts to account for it by transportation cost have been narrow. Attempts have been made to introduce a broader concept of accessibility as to include all features that contribute to the potential of opportunities of a location for interaction (Hansen 1959; Martellato et al. 1998). Though a comprehensive definition of the concept of accessibility is available, in practical applications the lack of data and appropriate measuring techniques usually implied that simple measures are used. Thus, in the literature we see a focus on some factors only, especially a CBD oriented interaction related to employment and shopping. In most property value studies, the other trip purposes are missing from the model.
The main focus in this paper is the analysis on the impact of railway accessibility as attributed by proximity to railway stations. However, it is important to realize that accessibility can also be provided by other modes of transport. As Voith (1993) has pointed out, highway accessibility is an important competitor to rail accessibility. ‘The presence of other facilities that increase accessibility like highways, sewer services and other facilities influence the impact area in the same fashion.’ The benefits of these facilities and services are also capitalised into urban property values (Damm et al. 1980). Thus, to single out the effect of railway accessibility, other competing modes of accessibility need to be included along with it.
The motivations for the studies on the impact of railway accessibility are diverse. The larger part of the literature on railway focuses on it as a feasible solution to the rising congestion posed by automobile traffic and urban sprawls. Railway investment is expected to support a more compact urban structure and therefore it serves the urban planning purpose (Goldberg 1981). Apart from reasons of showing that railway investments do result in compact urbanisation, most studies in the area were conducted to provide evidence for the implementation of value capture schemes for financing rail investments (Cervero and Susantono 1999). This was based on the assertion that the value of proximity to accessibility points is capitalised on the value of properties around these stations.
In general the empirical studies conducted in this area, on the impact of railway accessibility on property values, are diverse in methodology and focus. Although the functional forms can differ from study to study, the most common methodology encountered in the literature is hedonic pricing. However, no consistent relationship between proximity to railway stations and property values is recorded. Furthermore, the magnitudes of these effects can be minor or major. In one of the earliest studies, Dewees (1976) analysed the relationship between travel costs by railway and residential property values. Dewees found that a subway station increases the site rent perpendicular to the facility within a 1/3 mile to the station. Similar findings confirmed that the distance of a plot of land from the nearest station has a statistically significant effect on the property value of the land (Damm et al. 1980). Consistent with these conclusions, Grass (1992) later found a direct relationship between the distance of the newly opened metro and residential property values. Some of the extensively studied metro stations in the U.S., though ranging from small to modest impact, show that properties close to the station have a higher value than properties farther away (Giuliano 1986; Bajic 1983; Voith 1991). However, there are also studies, which have found insignificant effects (Lee 1973; Gatzlaff and Smith 1993). On the other hand, contrary to the general assumption, Dornbusch (1975), Burkhart (1976) and Landis et al. (1995) traced a negative effect of station proximity. Evidence from other studies indicates little impact in the absence of favourable factors (Gordon and Richardson 1989; Giuliano 1986). For detailed documentation of the findings, we refer to (Vessali 1996; Smith 2001; NEORail II 2001; Hack 2002; RICS, Policy Unit 2002). In general, some studies indicate a decline in the historical impact of railway stations on property values. This was attributed to improvements in accessibility, advances in telecommunications, computer networks, and other areas of technology that were said to make companies “footloose” in their location choices (Gatzlaff and Smith 1993).
Our main aim in this paper is to systematically analyse the variation in the findings of the studies discussed above. We use metaanalysis to provide a statistical analysis of the variations in the study findings. The impact of a railway station on the property values depends on several factors. First, railway stations differ from each other in terms of levels of service provided in terms of frequency, network connectivity, service coverage etc. Thus, it is natural to see stations with differing impact levels on the value of surrounding properties. Commuter railways have a relatively high impact on property value (Cervero and Duncan 2001; NEORail II 2001; Cervero 1984). Railway stations can differ in the level and quality of facilities they have. Stations with a higher level and quality of facilities are expected to have greater impact on the surrounding properties. The presence and number of parking lots is one of the many station facilities that got attention in this area. Bowes and Ihlanfeldt (2001) found that stations with parking facilities have a higher positive impact on property values. In addition, the impact a railway station produces depends on its proximity to the CBD. Stations, which lie close to the CBD, produce greater positive impact on property value (Bowes and Ihlanfeldt 2001). In addition Gatzlaff and Smith (1993) claim that the variation in the findings of the empirical work is attributed to local factors in each city.
Second, railway stations affect residential and commercial properties differently. Most studies treated the effect of railways on the different property types separately. That allows us somehow to explain the difference of railway effects on different property types. Generally it has been shown that the impact of railway stations is greater within short distance of the stations on commercial properties compared to residential ones. The larger part of the empirical literature on property value focuses on residential properties rather than commercial properties. Generally, it is claimed that the range of the impact area of railway stations is larger for residential properties, whereas the impact of a railway station on commercial properties is limited to immediately adjacent areas. In addition, there are claims that railway stations have a higher effect on commercial than on residential properties (Weinstein and Clower 1999; Cervero and Duncan 2001). This finding is in line with the assertion that railway stations—as focal, gathering points—attract commercial activities, which increase commercial property values. However, contrary to this assertion, Landis et al. (1995) determined a negative effect on commercial property values.
Third the impact of railway station on property value depends on demographic factors. Income and social (racial) divisions are common. Proximity to a railway station is of higher value to lowincome residential neighbourhoods than to highincome residential neighbourhoods (Nelson 1998; Bowes and Ihlanfeldt 2001). The reason is that lowincome residents tend to rely on public transit and thus attach higher value to living close to the station. Because of the fact that reaching the railway station mostly depends on slow modes (waking and bicycle) the immediate locations are expected to have higher effects than locations further away. On the other hand the high population movement in the immediate location gives rise to the development of retail activities which leads to premiums on value of commercial properties, but at the same time it may attract criminality (Bowes and Ihlanfeldt 2001). Bowes and Ihlanfeldt (2001) outlined that a significant relation was observed between stations and crime rates. In their model, the immediate neighbourhood is affected negatively by the station. Thus, the most immediate properties (within a quarter of a mile of the station) were found to have an 18.7% lower value. Properties that are situated between one and 3 miles from the station, however, are more valuable than those further away. Though this study provides an important contribution, unexplained variations still remain.
Metaanalysis of the Studies
In the previous section we briefly reviewed empirical work on the effects of station proximity on property value. Other reviews can be found in Vessali (1996), Smith 2001, NEORail II (2001), CIP Annual Conference (2002) and RICS, Policy Unit (2002). These studies also summarized empirical work in this area, but did not look for a systematic explanation of the variation in the findings. Our study not only summarizes earlier work, but also looks for a systematic explanation of differences in the results. Metaanalysis serves as an important tool for this purpose (Smith and Hang 1995; Cook et al. 1992). It provides statistical synthesis for empirical research focused on a common research question. It includes variables that represent study settings that are expected to explain the variation in the findings of the studies. In this case, all the reviewed studies focus on the impact of railway station proximity on property value. For the comparison of results to be meaningful, it is required that the studies have a comparable unit for the effect. However, in the studies which address the relationship between proximity to a railway station and property value we encounter different measurement units, although they aim at measuring similar effects. Thus, it is important that the findings are converted in to the same measurement unit.
In this study we apply a metaregression model. The effect sizes of proximity to the railway station on property value found by the different studies are the dependent variables, whereas the implicit or explicit characteristics of the underlying studies make up the dependent variables. A basic metaanalysis equation can be given as follows (Florax et al. 2002).
where
 Y :

the variable under study
 P :

set of causes of the out come Y
 X :

characteristics of the set of objects under examination affected by P in order to determine the outcome Y
 R :

characteristics of research method
 T :

time period covered by the study
 L :

the location of each study conducted
 ɛ :

the error term
Model Specification
Meta analysis models try to explain the difference in study findings by difference in study characteristics and other variables, for instance time and geographical effects. Thus, generally they belong to the family of hedonic pricing models. The logical order is first to identify the characteristics of the underlying studies that could explain the variations in effect sizes. The underlying studies usually include the proximity of the property to the station. However, we observe that not all studies use the same set of (explanatory) variables. The studies also differ in methodology. A railway station variable is mostly treated as a sole indicator of accessibility of a certain area. However, other modes serve the same purpose; for example, highway/freeway presence in the area under consideration. Although for our purpose it is important to note that they both have an effect on property values one can expect that these modes “interact” in a complementary (one can take a car to the railway station and then take the train) or competitive way (use car or train).
The underlying empirical studies employ different specifications, namely linear, semi logarithmic and log linear. In some studies the analyses are nonparametric in nature. Different specifications may also lead to different outcomes. In our analysis we further include type of railway station (light rail, heavy rail/Metro, commuter rail and Bus rapid transit), type of property (commercial, residential). We drop the location feature of the studies from our model because all the studies that are used in our final analysis were done in the US. We also examine whether the underlying study includes variables for the features of the properties and demographic features. All studies include features of the property in their analysis. Thus, our analysis includes six categories of variables to explain the difference in the findings of the impact of railway station proximity on property values. To account for the variation we specify a standard hedonic model using a simple linear regression specification given by Eq. 2 below.
Dependent variable
Y is the effect size for the impact of railway station proximity on property value (rent) in percentages.
Explanatory variables
P is a dummy variable that takes on the value 1 when commercial properties are analyzed (reference group is taken to be residential properties). S is a vector of dummy variables for the station type (heavy rail/ Metro, commuter rail, Bus rapid transit; light rail is the reference group). M is a vector of dummy variables for the model type (semi log, double log, non parametric; linear is the reference group). ACCESS is a dummy variable indicating the inclusion of other means of access to the area in the underlying study (usually highways and/or freeways). DM is a dummy variable indicating the presence of a demographic variable in the underlying study (usually income or racial composition of city quarters). T is a dummy for time trend (assume 1 for study data after 1990, study data before 1990 is taken as a reference group).
Some of these variables were used in the models of the underlying studies. Because most variables in the metaanalysis are dummy variables, the estimated coefficients represent the percentage contribution of each attribute on property value in comparison to the reference groups.
Data and Methodology
The database for the analysis of this paper is a pool of studies on the impact of railway station proximity on property value. A wide range of studies is covered. A total of 73 estimation results were obtained from the underlying studies. All these studies try to quantify the impact of proximity to a railway station on property values. Different specifications in the same underlying study are treated as separate observations. Thus, the total number of underlying studies is lower than the number of observations in our metaanalysis. However, due to the incompleteness of some of the studies with respect to the requirements of this study, we had to exclude certain observations. Our final estimation is based on 57 observations.
Variation in the Presentation of the Findings
The dependent variable in our metaanalysis is expressed as the percentage change in property value per some distance measure to the station. The underlying studies are quite diverse in the way the impact of railway station proximity is reported, including pure monetary effects, percentage effects and elasticity measures. However, the larger part of these studies reports the percentage increase or decrease in property value for a certain distance. In addition to the diversity of measurements, the studies also use a variety of methodologies. We summarize them in two categories; which are discussed next.

I.
Studies using parametric estimation methods
These studies use econometric methods to estimate the impact of railway station proximity on property value. Linear, semi log and log linear (also called double log) specifications are common. Two categories of railway station proximity measurement were encountered.

1.
Station proximity as a continuous measure
These studies consider the proximity to a railway station as a continuous variable. The variable can be measured in distance, time (walking time) or monetary savings (Dewees 1976; Nelson 1992; Benjamin and Sirmans 1996; LewisWorkman and Brod 1997; Chen et al. 1998; Gatzlaff and Smith 1993). The results are given in monetary units (as in linear models) or in percentage units (as in semi log and log linear models). The results of the semi log models are in line with the dependent variable in our metaanalysis. Therefore, the monetary changes and elasticities have to be transformed into a percentage change per distance using the average property value and average distance data reported in each underlying study. Coefficients of semi log and double log specifications represent incomparable measures. To bring them into comparable units we divided the elasticity by the average distance of the impact area. The rent curves can have structures similar to (a) in Fig. 1 (Table 1).

2.
Station proximity as a distance category measures:
These studies treat the proximity variable as a discrete variable (represented by a dummy). The area under consideration is segmented into two or more parts, where the outer segment is treated as the reference (McDonald and Osuji 1995; Fejarang 1994; Dueker and Bianco 1999; Weinstein and Clower 1999; Voith 1993; Armstrong 1994; Grass 1992; Bowes and Ihlanfeldt 2001; Cervero and Duncan 2001, 2002a,b; Weinberger 2001). Sample of presentation of effects of this type are given in Table 2. The rent curve for these types can be given by (b) in Fig. 1.

1.

II.
Nonparametric measures:
These studies do not use econometric methods to estimate the effect of railway stations on property values. They can measure the proximity variable in continuous or discrete terms. The common feature of these studies is that the difference in property value is implicitly attributed to the railway station effect only. Some examples of this sort are given in Table 3.
The Dependent Variable in the Metaanalysis
For metaanalysis it is essential that the dependent variable is measured in comparable units. Due to the diverse ways of presenting the effect sizes, a matching process was necessary to transform them in to effect sizes of the same measurement unit. For the purpose of our analysis, two proximity measures considerations are selected: a stepwise treatment and continuous treatment on proximity. From the stand point of the stepwise treatment of distance, the effect of railway station proximity on values of properties located within 1/4 mile of the station effect was prominent. Thus, we prepared the effect of railway on the property value for properties located within this range compared to the properties out of this range. In addition, an effect size for the continuous distance treatment was prepared. For this consideration the effect sizes of railway station proximity impact on property value for every 250 m closer to the station are prepared.
Due to the large differences between the underlying studies in reporting the finding some conversion mechanism is required. We mention three elements of this mechanism:

1.
We consider railway station impacts up to a maximum distance of 2 miles, unless otherwise indicated.

2.
The properties under study are evenly distributed in concentric circles around the railway stations. Thus, due to the fact that larger circles lead to an area enlargement, the average distance to the station for each segment is given by a + 2/3*(b − a), where a is the distance the border of the inner concentric circle to the station, and b is the distance between the border of the outer segment and the railway station. For the station itself we have a = b = 0.

3.
The impact of a station in the same segment in a circle is uniform.
For studies that provide the impact for several segments, the continuous railway station impact (see for example Table 2) is estimated by the approach outlined in Appendix. However, for studies that looked at one (immediate) segment, as compared to the outer segment, we have estimated the continuous station effect per distance by point estimation (under the above assumptions). The type of model used to determine the effect can actually influence the effect (compare e.g. point elasticity estimates to interval estimates). Although most studies were parametric, a few studies used a nonparametric model, as discussed above. We adopt a unit of measurement equal to 250 m. Thus, the dependent variable in the metaanalysis is the percentage change in property value (rent) for every 250 m coming closer to the railway station. In addition we have prepared the effect of the railway station on the immediate segment (within a quarter mile of the station). Therefore, our estimation is based on these two data sets.
Independent Variables
The impact of railway station proximity on station on property value as reported in the underlying studies can be affected by several factors. The type of property value under study may be important, because commercial and residential properties may be affected differently. Different types of railway stations may have different impacts because the frequency of service or the service coverage may be different, etc. Four types of rail transit services are identified: light, heavy, commuter and rapid bus transits. Three types of parametric models were encountered: linear, semilog and log linear. Temporal effect is represented by dividing the data in two categories: data before 1990 and data after 1990. We also included a variable for the presence of other accessibility variables (highways and freeways are of interest here), and demographic features in the underlying studies, as discussed above. As shown in Table 4, these considerations lead to six categories of dependent variables in our metaanalysis.
Descriptive Statistics
Table 5 presents the descriptive statistics of the dependent variable. Overall characteristics and characteristics per group (defined by the independent variables) of the dependent variable are given. The overall mean impact of a railway station on property value for properties that lay within 1/4 mile of the station compared to the value of properties laying beyond this range is 8.60%. The range of the property value effect is considerable: −61.90 to 145%. Concerning the continuous distance measure, the impact of a station on property value (rent) for every 250 m closer to the station is 2.61%. The t able shows that the range is considerable; it varies from −12.84 to +38.70%. In computing the means no weighting is applied.
From Table 5 we also learn that railway stations have a higher average effect on commercial properties compared to residential properties. However, the corresponding standard deviations are quite high. Commuter railway stations have higher impact on property values than the other three types of railway stations. Contrary to the literature assertion that railway stations have lower impact on multi family or condominium properties, as compared to singlefamily properties, the table indicates higher impact on singlefamily properties (Cervero 1997; Cervero and Duncan 2002a,b), although the differences are not significant.
The table also gives some simple comparison tests of the means for each of the categories. The t test statistic in the table is a groupwise mean equality test. In each category the equality test is done against the reference group in each category. The null and the alternative hypotheses of the test are given as follows. \( H_{0} :{\text{Mean}}{\left( {\left. {{\text{ES}}} \right{\text{ref}}} \right)}  {\text{Mean}}{\left( {\left. {{\text{ES}}} \rightj} \right)} = 0 \) and \( H_{a} :{\text{Mean}}{\left( {\left. {{\text{ES}}} \right{\text{ref}}} \right)}  {\text{Mean}}{\left( {\left. {{\text{ES}}} \rightj} \right)} \ne 0 \), where ES is the effect size of the studies, j is an identifier of a group in the same category as the reference (ref). For instance, for the category ‘type of railway station’ light rail transit stations are the reference, whereas the other type of stations are compared to this. The test is performed under the assumption that population variance is the unique. The t test statistic is given by:
Random Effect Metaregression Model
Meta analysis tries to explain variation in effect sizes by means of determinants as incorporated in Eq. 2. In the literature, metaregression is used from four different approaches: fixed effects, random effects, control rate, and Bayesian hierarchical modelling (Morton et al. 2004). Fixed effect models assume that these estimates are random draws of one true value. The effect sizes included in the meta analysis represent the estimates of the true value for the study with some degree of imprecision. Thus, the variance in the meta analysis only comes from sampling error. However, substantial heterogeneity among the estimates can be an indication that the true effect value in the estimates is not unique. In such a situation Higgins and Thompson (2004) have indicated that fixed effect metaregression models suffer from false positive results compared to the conventional regression model. The use of random effect models is believed to reduce spurious findings. In our case the standard Q statistics for the homogeneity test shows that the effect sizes of railway station proximity on property value show substantial heterogeneity^{Footnote 1}. This justifies the use of a random effects model for the meta analytical procedure. The random effects model assumes that the variance associated with each effect size has two components: the within study variance and the between studies variance.
In this paper we apply the random effect metaregression model to explain the variation in the effect sizes of railway station proximity effect on property values. The variance of the effect size in this modelling approach is the sum of the two variance components, namely the within study variance \( {\left( {{\text{ }}\sigma ^{2}_{i} } \right)} \)and the between studies variance (τ ^{2}) components. Thus, the weight for each of the effect sizes is the reciprocal of this total variance\( {\left( {w_{i} = 1 \mathord{\left/ {\vphantom {1 {{\left( {\sigma _{i} ^{2} + \tau ^{2} } \right)}}}} \right. \kern\nulldelimiterspace} {{\left( {\sigma _{i} ^{2} + \tau ^{2} } \right)}}} \right)} \). The estimation procedure proceeds in two stages. First, the between studies variation measure (τ ^{2}) is determined. Second, using the updated weight considering the within study and between studies variation, the regression analysis is performed; the regression equation estimated in this paper is given in Eq. 2. The Stata based metaregression routine (metareg) is used to run the estimation. An important feature of the random effect metaregression is that Rsquare is not reported; instead the τ ^{2}is reported. In Figs. 2 and 3 the effect sizes used in our analysis are plotted against the corresponding standard errors of the effect sizes. Both graphs show a similar pattern, although the scale is difference due to the different distance measures used.
Estimation Results
To explain the variation in the findings of the railway station proximity effect on property value by various study characteristics, we performed two estimations. As indicated in Section 3.2, the first estimation explains the impact of station proximity on the value (rent) of properties located within 1/4 mile (402 m) of the station. The impact is measured as the relative change in property value. The second estimation explains the impact of station proximity on property value (rent) for every 250 m distance closer to the station. The explanatory variables for the two estimations are given in Table 4. The outputs of the random effect metaregression model based on 55 effect sizes are given below.

1.
Local effect of railway proximity:
In this case the dependent variable is the effect of railway station proximity on properties lying within the 1/4 mile distance from the station, compared to properties located outside this range. This measures the most localized impact of railway station accessibility on property value. The distance category is common to many studies. In addition, this range represents locations within walking distance. The random effect estimation results for this specification are given in Table 6.
In Table 6 we see the τ ^{2} is greater than 0 (which would be the outcome in the case the fixed effect assumption would hold). This shows that there is substantial variation between the effect sizes (ES) of the studies. This confirms the justification for the use of a random effect model. Railway station proximity has a higher effect on commercial property compared to residential properties. The gap between the price within the 1/4 mile zone and the remaining part of the city is larger for commercial property than it is for residential property: to be more precise: it is 12% larger. Table 5 shows that where the price gap between the railway station zone and the rest is about 4.2% for the average residence, it is about 16.4% for the average commercial property.
The coefficients for heavy and commuter rail transit are positive, indicating that the effects of heavy and commuter rail transit on property value are greater than light rail transit (the base line in the estimation). Heavy railway transit stations have a 0.9% higher effect on property value compared to the effect of light rail transit stations. However, the significance level for this variable is low. On the other hand, a commuter rail transit station has a significantly higher effect on property value compared to light rail transit stations. It has an effect as big as 14.1% higher than the effect of light rail transit stations. This finding is consistent with the a priori expectation, and reflects the fact that commuter railways usually have wider service coverage (i.e. a larger catchment area).
The inclusion of other accessibility factors (highway, freeway) in the underlying studies significantly reduces the level of the reported station impact on property values (the reference group is the “no alternative accessibility variable in underlying study”). This shows that highways and freeways are also important determinants of property value (rent), next to railway station proximity. When both are included in the models (railway station and other modes) the effect on property value is “shared” between the two different modes. Models with highway accessibility on average report 18.7% lower railway station proximity effects on property value than models excluding highway accessibility. The type of model specifications, temporal features and demographic characteristics in the underlying studies show no significant explanatory power for the variation in the effect sizes of the studies.

2.
Global effect railway station distance
In addition to the localized effect measure discussed above, effect sizes of railway station proximity for a wider range of distance from the stations were determined. Distance is now represented as a continuous measure. The effect sizes used in the estimation here represent the effect on property values of coming 250 m closer to the railway station. There is no special reason for the choice of the 250 m measure. The dependent variable values are given in percentage units. We use the term “global effect” since the linear effect measure accounts for the whole range of distances to the railway station covered by the studies. The estimation results are given in Table 7 below.
Making use of the average value of the explanatory variables, this regression means that for every 250 m closer to a station, house prices increase with 2.4%. On the other hand the value of commercial properties increases 0.1% for every 250 m closer to a station.
The results from this estimation are in some respect different compared to the localized effect analysis discussed above. This shows that different spatial considerations in addressing railway station proximity have different impact implication on some study characteristics. We see a change in the sign for the effect on commercial properties compared with the residential properties. This means that the rent curve as a function of distance to the railway station is steeper for residential property than for commercial property. This is a remarkable result since the opposite was found for the local effects of stations (see Table 7). The reason for this difference is that for commercial property the direct proximity effect dominates: only when the office is within walking distance of the station (about 1/4 mile) it benefits, otherwise the station is of little use and hence the rent curve is rather flat. The flat nature of the rent curve for distances further away than 1/4 mile apparently dominates the pattern here. Since dwellings are located at the trip origin side of stations one may also use the car as an access mode and this gives the rent curve a higher slope across the whole range of distances.
Bus rapid transit stations (BRT) also have significantly lower effect on property value compared to the effect of light railway stations. The signs of the effects for commuter rail transit and accessibility variable inclusion are not affected. Commuter railway stations have on average 3% higher effect on property values for every 250 m closer to the station as compared to the effect of light railway stations. In addition to the presence of the accessibility variable, the presence of demographic variables in the studies also lowers the reported railway station effect on property value. This underlines again the importance of omitted variables bias in this type of studies.
Conclusion
The impact of railway station proximity on property value has received wide attention in the economic literature. Several empirical studies tried to quantify this effect. However, the conclusions are not uniform. The aim of this paper is to find a systematic explanation for the variation in railway station impact findings. We established that the different features of the study settings could explain these variations. We have tried to relate the variation with seven categories of variables. These are type of property under consideration, type of railway station, type of model used to derive the valuation, the presence of specific variables related to accessibility, demographic features and lastly the time of the data. The impact of railway stations on property value differs across property types. Generally speaking railway stations are expected to have a higher positive effect on commercial properties compared to residential properties for relatively short distances from the stations. Among the four types of railway stations, commuter railway stations are expected to have higher impacts on the property values. The presence of accessibility and house quality variables is expected to have a negative effect on the magnitude of the impact of the station on the property value reported. We do not have prior expectation on the impact of a specific functional form on the effect size for station proximity. This paper presents two estimations based on two proximity considerations. First we consider a local station effect by analyzing the effect railway station on properties within a range of 1/4 mile from the station. Second a more global effect is analyzed based on a continuous measure of distance for a wider distance range.
Throughout the analysis, commuter railway stations show a significantly higher impact on property values compared to light or heavy railway/Metro stations. Their higher service coverage adds to the attraction of the area surrounding the stations. In addition the number of commuter railway stations is (relatively) low compared to light and heavy railway/Metro stations. The effect of a railway stations on different property types is subject to spatial considerations. The effect on commercial properties is generally local. On average, commercial properties within 1/4 mile of the station sell or rent 12.2% higher than residential properties in the same distance range. Where the price gap between the railway station zone and the rest is about 4.2% for the average residence, it is about 16.4% for the average commercial property. Note that the reference group for both properties is the set of properties that lay beyond the 1/4 mile range from the railway stations. However, on a global effect consideration the relative impact is revered. On average, for every 250 m coming closer to the station, the effect of railway station is 2.3% higher for residential properties compared to commercial properties.
A given area can be made accessible by a number of modes (railways, car, etc.). Each mode will improve the accessibility of the region independently. All of the studies used in the metaanalysis analyze the (isolated) effect of a railway station on property value. When other accessibility modes are included in the underlying studies, railway stations generally have a lower impact on property value. Although both highways (freeways) and stations may increase property values, there is a negative correlation between the two effects; when one is present in a study, the effect of the other is diminished. Thus, we find an example of omitted variable bias: when highway accessibility is not explicitly addressed, railway impacts on property values tend to be overestimated specially in the continuous space specification.
Notes
The homogeneity test’s Q statistics is given by \( Q = {\left( {{\sum {w_{i} {\text{ES}}_{i} } }^{2} } \right)}  {{\left( {{\sum {w_{i} {\text{ES}}_{i} } }} \right)}^{2} } \mathord{\left/ {\vphantom {{{\left( {{\sum {w_{i} {\text{ES}}_{i} } }} \right)}^{2} } {{\sum {w_{i} } }}}} \right. \kern\nulldelimiterspace} {{\sum {w_{i} } }} \) where w _{ i } is the weight of the effect size (ES) of study i given by the inverse of the variance. Q is chisquare distribution. For the data in the analysis Q = 1,212, where the critical value for 5% and 56 degrees of freedom is 74.5. This indicates the effect sizes have substantial heterogeneity. This calls for a random effect model of estimation.
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Appendix
Appendix
Deducing the continuous railway station effect from discrete measures
The basic methodology for this was to linearize the impact over the different segments. For this method to work, it is required that the studies used at least three segments, including the reference segment in their analysis. Based on the assumptions described in Section 5.2.2, we can fairly say that the impact of railway station proximity on properties at the average distance of the segment from the station represents the effect of the station on the segment. The average distance of each segment is given by \( d = a + 2 \mathord{\left/ {\vphantom {2 3}} \right. \kern\nulldelimiterspace} 3*{\left( {b  a} \right)} \), where “a” is the distance of the inner circle to the station and “b” is the distance of the outer circle of the segment to the station. The reference segment’s (the segment with value 100) outer circle is specified based on assumption one unless otherwise specified in the underlying studies. This gives us two corresponding variables (distance and value) for which we can estimate percentage change in property value per unit of the distance measure using semi log specification:
where “value” is the value of properties at distance D from the railway station. The value of the coefficient b _{1} measures the percentage change on property value for a unit change of distance.
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Debrezion, G., Pels, E. & Rietveld, P. The Impact of Railway Stations on Residential and Commercial Property Value: A Metaanalysis. J Real Estate Finan Econ 35, 161–180 (2007). https://doi.org/10.1007/s111460079032z
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DOI: https://doi.org/10.1007/s111460079032z