Objectives

Examine and visualise the temporal concentration of different crime types and detect if their intensity varies through distinct moments of the week.

Methods

The “heartbeat of the crime signal” is constructed by overlapping the weekly time they were suffered. This study is based on more than 220,000 crimes reported to the Mexico City Police Department between January 2016 and March 2020 to capture the day and time of crimes and detect moments of the week in which the intensity exceeds the average frequency. A new metric for the temporal concentration of crime is constructed for different types of crime and regions of the city based on the corresponding heartbeats.

Results

The temporal concentration of crime is a stable signature of different types of crime. The intensity of robberies and theft is more homogeneous from Monday to Sunday, but robberies of a bank user are highly concentrated in a week, meaning that few hours of the week capture most of the burning moments. The concentration is not homogeneously distributed in the city, with some regions experiencing a much higher temporal concentration of crime.

Conclusions

Crime is highly concentrated when observed in its weekly patterns, but different types of crime and regions exhibit substantially distinct concentration levels. The temporal trace indicates specific moments for the burning times of different types of crime, which is a critical element of a policing strategy.

中文翻译：

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每周犯罪集中度

目标

检查并可视化不同犯罪类型的时间集中度，并检测它们的强度是否在一周的不同时刻发生变化。

方法

“犯罪信号的心跳”是通过重叠他们每周遭受的时间来构建的。这项研究基于 2016 年 1 月至 2020 年 3 月期间向墨西哥城警察局报告的 220,000 多起犯罪，以捕捉犯罪的日期和时间，并检测一周中强度超过平均频率的时刻。基于相应的心跳，为不同类型的犯罪和城市区域构建了一个新的犯罪时间集中度指标。

结果

犯罪的时间集中度是不同类型犯罪的稳定特征。抢劫和盗窃的强度在周一到周日更为均匀，但银行用户的抢劫事件高度集中在一周内，这意味着一周中的几个小时会捕捉到大部分的燃烧时刻。犯罪集中度在城市中分布不均，一些地区的犯罪时间集中度要高得多。

结论

从每周模式观察，犯罪高度集中，但不同类型的犯罪和地区表现出截然不同的集中度。时间痕迹表示不同类型犯罪的燃烧时间的特定时刻，这是警务策略的关键要素。