Abstract
This study tests the law of crime concentration at place in Brussels Capital Region (approx. 1.2 million inhabitants) and examines the spatial stability of crime concentrations by applying Andresen’s Spatial Point Pattern Test. Besides testing the law of crime concentration city-wide, this study also tests the law of crime concentration in the context of Brussels’ six police departments and 19 municipalities. Police-registered crime data (n = 228,606 incidents) for the period 2007–2016 were used, which were geocoded at the spatial micro-level of grid cells (200 by 200 m). The results indicate that residential burglary is less concentrated in Brussels, although the concentrations of aggressive theft and battery are in line with previous tests of the law of crime concentration in Europe and the United States. Nevertheless, the results also indicate that crime concentrations vary significantly across Brussels’ police departments and municipalities, which seem to be higher in larger municipalities and police departments. In addition, the spatial patterns of residential burglary, aggressive theft and battery were not spatially stable in Brussels between 2007 and 2016. This study indicates that considerable attention should be payed to tailoring place-based policing approaches to the characteristics of each crime type, including the spatial concentration and the spatial stability of crime. More research is needed into the underlying factors of low or high crime concentrations and the mechanisms of spatial (in)stability at the spatial micro-level.
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Data Availability
The crime datasets generated during and/or analysed during the current study are not publicly available due to constraints imposed by the involved police departments but are available from the corresponding author on reasonable request.
Notes
In this study, we use Brussels to refer to Brussels Capital Region.
This relates to the Modifiable Area Unit Problem (MAUP). The MAUP can be linked to the statistical modelling of certain phenomena, such as crime, for which the aerial units of analysis may vary according to the size and shape of the units, so that identical data that are aggregated in different ways may bring about different and thus biased results (Dark & Bram, 2007; Fotheringham & Wong, 1991; Oberwittler & Wikström, 2009; Openshaw, 1984). This problem has traditionally been characterised by designating two major issues, namely scale and zonation effects. Scale effects mainly occur when the analysis of a particular phenomenon yields different results depending on the size of the units of analysis (aggregation level), whereas zonation effects occur when the results of the statistical analysis differ depending on the artificial boundaries used, i.e., how the study area is divided up, all else being equal (ceteris paribus). By using grid cells as unit of analysis, we may designate fixed aerial boundaries as each grid cell has the same geographical structure, allowing us to investigate crime concentrations in a more standardised and uniform way (in this study, grid cells of 200 by 200-m).
The crime datasets generated during and/or analysed during the current study are not publicly available due to constraints imposed by the involved police departments but are available from the corresponding author on reasonable request.
Because the Federal Police Department provided the crime data in a geocoded format with X and Y coordinates of the crime events, we cannot provide any information about the geocoding hit rate nor with regard to the missing streets and house numbers.
The most recent version of the SPPT developed for R uses 100% sampling with replacement, however, no significant differences were found when comparing the results of both versions.
It appeared that municipalities (n = 19) with a lower proportion inhabited area tend to have lower percentages of micro-places accounting for 50 % of the residential burglaries between 2007 and 2016 (r = 0.83). Although this is an ecological correlation, that should be interpreted as such, this suggests a relationship between the proportion inhabited area and the concentration of residential burglary, where areas with a lower proportion of inhabited area have relatively fewer residential properties that can be targeted by burglars and, hence, crime will be more concentrated.
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The authors would like to thank the Federal Police of Belgium for providing the data used in this study.
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Appendices
Appendix 1. Characteristics of Brussels’ six police departments and 19 municipalities
Appendix 2. Bivariate global and robust global S-indices
Appendix 3. Local S-indices
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Khalfa, R., Snaphaan, T., Pauwels, L. et al. Crime within a Bandwidth: Testing “the Law of Crime Concentration at Place” in Brussels. Eur J Crim Policy Res (2023). https://doi.org/10.1007/s10610-023-09556-8
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DOI: https://doi.org/10.1007/s10610-023-09556-8