Bearfield, Maranto, and Wolf advise policy-makers to measure policing outcomes using a metric that includes rates of homicide, police-related civilian deaths (PRCD), and poverty. They present such an index, which they call the Police Performance Index (PPI). But alternative functional forms that are equally plausible can lead to different rankings of police departments, and therefore different policy conclusions.

中文翻译：

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警察绩效排名取决于指数的功能形式：对贝尔菲尔德、马兰托和沃尔夫的评论

Bearfield、Maranto 和 Wolf 建议政策制定者使用包括凶杀率、与警察有关的平民死亡率 (PRCD) 和贫困率在内的指标来衡量警务结果。他们提出了这样一个指数，他们称之为警察绩效指数（PPI）。但同样合理的替代职能形式可能导致不同的警察部门排名，从而导致不同的政策结论。