Abstract
We present a Bayesian hedonic regression model for the appraisal of apartments located within the metropolitan area of Belgrade, Serbia. Data on 12.904 apartments were collected from a local classified website, and used to fit and validate the model. The response variable, which is the price per m\(^2\) in euros, is assumed to be log-normally distributed. Nested random effects are used to model the hierarchical structure present in the location identifiers, and thin-plate spline functions are used to capture the nonlinear effects. Location explains around 78.62% of the total variation in advertised prices per m\(^2\) in the training set, confirming its paramount importance. Further major factors affecting prices are: area in m\(^2\), floor number, the total number of floors in the building, the availability of an elevator and condition. The predictive functionality of the model is demonstrated through an open access online application that accompanies this study. The model achieves Mean Average Percent Error (MAPE) of 13.06% in the validation set. Its predictive performance is compared to that of three popular machine learning (ML) methods, and its suitability for mass appraisal is examined. This is the first empirical study to present the results obtained from a hedonic regression built using data pertaining to Belgrade.
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Notes
- 1.
In Serbia there is an available organized database of transactional property prices, maintained by The Republic Geodetic Authority (https://katastar.rgz.gov.rs/RegistarCenaNepokretnosti/). However, the structure of data does not allow for an adequate assessment of the predictive accuracy of the models presented in this paper; except for the address, the date of transaction, the size and the cadastral parcel, any other information about the quality and the state of the property is missing. The database is available both for public and professional access, but there is a very small difference in the quality of information obtained in both. However, professional access is costly for any sort of research which demands a large amount of data about transactional prices.
- 2.
Asking price is “a price at which a seller commits to taking his good off the market and trading immediately” as defined in [35].
- 3.
Market price is “the estimated amount for which the property should exchange on the date of valuation between a willing buyer and a willing seller in an arm’s-length transaction after proper marketing wherein the parties had each acted knowledgeably, prudently and without being under compulsion”, as defined in [36].
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Acknowledgements
This research was supported by the Science Fund of the Republic of Serbia, #GRANT No. 65241005, AI—ATLAS.
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Appendix
Appendix
Appendix A: Estimated Regression Coefficients
Population-level effect | Estimate | Estimate Error | l-95 % CI | u-95 % CI | Exponentiated coefficient estimate |
---|---|---|---|---|---|
Intercept | 7.12 | 0.23 | 6.67 | 7.59 | 1236.45 |
s(Area_in_sqm) | −1.60 | 0.84 | −3.21 | 0.00 | 0.20 |
s(Num_of_rooms) | −0.01 | 0.08 | −0.18 | 0.15 | 0.99 |
\(\text {s(Floor\_num} \times \text {Stories)}\) | −2.13 | 0.36 | −2.82 | −1.45 | 0.12 |
\(\text {s(Floor\_num} \times \text {Stories)2}\) | 0.79 | 0.33 | 0.14 | 1.43 | 2.20 |
\(\text {s(Floor\_num} \times \text {Elevator[No])}\) | −1.57 | 47.90 | −88.73 | 113.03 | 0.21 |
Elevator[No] | −0.19 | 0.23 | −0.57 | 0.34 | 0.83 |
Not_at_top_floor[No] | −0.02 | 0.00 | −0.02 | −0.01 | 0.98 |
Registered_in_cadaster [No] | −0.02 | 0.00 | −0.03 | −0.01 | 0.98 |
Move_in_ready[No] | 0.01 | 0.00 | 0.00 | 0.01 | 1.01 |
VAT_refund[No] | 0.00 | 0.01 | −0.01 | 0.01 | 1.00 |
Belgrade_WF[Yes] | 0.28 | 0.17 | −0.05 | 0.60 | 1.32 |
Duplex[Yes] | 0.07 | 0.06 | −0.05 | 0.18 | 1.07 |
\(\text {Belgrade\_WF[Yes]} \times \text {Duplex[Yes]}\) | 0.16 | 0.08 | 0.00 | 0.32 | 1.17 |
Balcony[No] | −0.02 | 0.00 | −0.02 | −0.01 | 0.98 |
Recessed_balcony[No] | 0.00 | 0.00 | −0.01 | 0.00 | 1.00 |
Phone[No] | 0.01 | 0.00 | 0.00 | 0.01 | 1.01 |
Intercom[No] | −0.01 | 0.00 | −0.02 | 0.00 | 0.99 |
Air_conditioner[No] | −0.01 | 0.00 | −0.02 | −0.01 | 0.99 |
Surveillance[No] | −0.01 | 0.00 | -0.02 | -0.01 | 0.99 |
Internet[No] | 0.01 | 0.00 | 0.00 | 0.01 | 1.01 |
Cable_TV[No] | 0.00 | 0.00 | 0.00 | 0.01 | 1.00 |
Garage[No] | −0.05 | 0.00 | −0.06 | −0.04 | 0.95 |
Parking[No] | 0.01 | 0.00 | 0.00 | 0.01 | 1.01 |
Basement_storage[No] | −0.01 | 0.00 | −0.01 | 0.00 | 0.99 |
Condition[Lux] | 0.01 | 0.00 | 0.00 | 0.01 | 1.01 |
Condition[Renovated] | −0.07 | 0.00 | −0.08 | −0.06 | 0.93 |
Condition[MissingInfo] | 0.05 | 0.00 | 0.04 | 0.06 | 1.05 |
Type[NewBuilt] | 0.01 | 0.00 | 0.00 | 0.02 | 1.01 |
Type[UnderConstruction] | −0.08 | 0.01 | −0.09 | −0.07 | 0.92 |
Type[MissingInfo] | −0.01 | 0.01 | −0.03 | 0.00 | 0.99 |
Heating[DistrictHeating] | 0.02 | 0.00 | 0.01 | 0.03 | 1.02 |
Heating[ElectricThermalStorage] | −0.06 | 0.01 | −0.07 | −0.05 | 0.94 |
Heating[MarbleHeaters] | −0.03 | 0.03 | −0.10 | 0.02 | 0.97 |
Heating[MissingInfo] | 0.03 | 0.01 | 0.01 | 0.04 | 1.03 |
Heating[NaturalGas] | 0.02 | 0.01 | 0.00 | 0.04 | 1.02 |
Heating[NorwegianPanelHeaters] | −0.05 | 0.01 | −0.08 | −0.02 | 0.95 |
Heating[TiledStove] | −0.04 | 0.03 | −0.11 | 0.02 | 0.96 |
Heating[UnderfloorHeating] | 0.06 | 0.02 | 0.02 | 0.09 | 1.06 |
Advertiser[Bank] | −0.02 | 0.12 | −0.26 | 0.21 | 0.98 |
Advertiser[Investor] | −0.02 | 0.02 | −0.06 | 0.02 | 0.98 |
Advertiser[Owner] | 0.00 | 0.01 | −0.02 | 0.02 | 1.00 |
AgencyFee[1%] | 0.06 | 0.09 | −0.11 | 0.23 | 1.06 |
AgencyFee[1.50%] | 0.05 | 0.15 | −0.26 | 0.35 | 1.05 |
AgencyFee[2%] | 0.03 | 0.02 | −0.01 | 0.08 | 1.03 |
AgencyFee[2.40%] | 0.15 | 0.10 | −0.06 | 0.36 | 1.16 |
AgencyFee[MissingInfo] | 0.02 | 0.02 | −0.02 | 0.07 | 1.02 |
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Stanišić, N., Radojević, T., Stanić, N. (2021). Appraisal of Apartments in Belgrade Using Hedonic Regression: Model Specification, Predictive Performance, Suitability for Mass Appraisal, and Comparison with Machine Learning Methods. In: Pap, E. (eds) Artificial Intelligence: Theory and Applications. Studies in Computational Intelligence, vol 973. Springer, Cham. https://doi.org/10.1007/978-3-030-72711-6_16
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