Volume 11, Number 23, December 2021

A Fair Allocation Algorithm for Predictive Police Patrolling

  Authors

Isabella Rodas Arango¹, Mateo Dulce Rubio¹ and Alvaro J. Riascos Villegas^1,2, ¹Quantil, ²Universidad de los Andes

  Abstract

We address the tradeoff of developing good predictive models for police allocation vs. optimally deploying police officers over a city in a way that does not imply an unfair allocation of resources. We modify the fair allocation algorithm of [1] to tackle a real world problem: crime in the city of Bogota, Colombia. Our approach allows for more sophisticated prediction models and we ´ show that the whole methodology outperforms the current police allocating mechanism in the city. Results show that even with a simple model such as a Kernel Density Estimation of crime, one can have much better prediction than the current police model and, at the same time, mitigate fairness concerns. Although we can not provide general performance guarantees, our results apply to a real life problem and should be seriously considered by policy makers.

  Keywords

Predictive Policing, Algorithmic Fairness, Optimal Allocation of Police, Censored Data.