In New York City, neighborhood policing was adopted at the police precinct level over the years 2015-2018, and it is of interest to both (1) evaluate the impact of the policy, and (2) understand what types of communities are most impacted by the policy, raising questions of heterogeneous treatment effects. We develop novel statistical approaches that are robust to unmeasured confounding bias to study the causal effect of policies implemented at the community level. We find that neighborhood policing decreases discretionary arrests in certain areas of the city, but has little effect on crime or racial disparities in arrest rates.

翻译：在纽约市,在2015-2018年的几年里,警方在警区一级通过了邻里治安,这关系到:(1) 评估该政策的影响,(2) 了解该政策对哪些类型的社区的影响最大,提出了不同待遇影响的问题。我们制定了新的统计方法,这些方法对在研究社区一级执行的政策的因果关系时无法衡量的偏见具有很强的说服力。我们发现,邻里治安减少了该市某些地区的酌情逮捕,但对犯罪或逮捕率的种族差异没有多大影响。