Objectives

To examine the extent to which different operationalizations of target, displacement, and comparison sites affect the interpretation of a CCTV impact evaluation.

Methods

Different operationalizations are used to examine change in property and violent crime before and after CCTV was introduced in a residential neighbourhood in Malmö, Sweden, using paired t tests, odds ratio effect sizes and weighted displacement quotients.

Results

Despite most results being non-significant as a result of low statistical power, different operationalizations appear to produce varying results. This issue is most prominent for target sites and property crime while it is less so for catchment and comparison sites, and violent crime outcomes.

Conclusion

Valid operationalizations of research areas are highly important for CCTV impact evaluations and may affect the study outcome. Future research with access to larger data sets is encouraged to elaborate on these findings and further analyse the impact of measurement choices on experimental outcomes.

中文翻译：

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目标，流域和比较站点的运行对闭路电视影响评估的影响：案例研究中的方法学考虑

目标

检查目标，位移和比较站点的不同操作对CCTV影响评估的解释的影响程度。

方法

在闭路电视被引入瑞典马尔默的一个居民区之前和之后，使用成对的t检验，比值比效应大小和加权商数，采用了不同的操作方法来检查闭路电视的财产和暴力犯罪的变化。

结果

尽管由于统计能力低而导致大多数结果不重要，但不同的操作方法似乎会产生不同的结果。这个问题在目标地点和财产犯罪中最为突出，而在集水区和比较地点以及暴力犯罪结果方面则较少。

结论

研究领域的有效运作对于CCTV影响评估非常重要，并且可能会影响研究结果。鼓励将来获得更大数据集的研究详细阐述这些发现，并进一步分析测量选择对实验结果的影响。