Cited by 441Crime Patterns and InterventionsPolicing Practices and PerceptionsCriminal Justice and Penology

Randomized Controlled Field Trials of Predictive Policing

Open access
Mohler, G. O., Short, M. B., Malinowski, Sean, Johnson, Mark, Tita, G. E., Bertozzi, Andrea L., Brantingham, P. J.·2015·Journal of the American Statistical Association

Abstract

The concentration of police resources in stable crime hotspots has proven effective in reducing crime, but the extent to which police can disrupt dynamically changing crime hotspots is unknown. Police must be able to anticipate the future location of dynamic hotspots to disrupt them. Here we report results of two randomized controlled trials of near real-time epidemic-type aftershock sequence (ETAS) crime forecasting, one trial within three divisions of the Los Angeles Police Department and the other trial within two divisions of the Kent Police Department (United Kingdom). We investigate the extent to which (i) ETAS models of short-term crime risk outperform existing best practice of hotspot maps produced by dedicated crime analysts, (ii) police officers in the field can dynamically patrol predicted hotspots given limited resources, and (iii) crime can be reduced by predictive policing algorithms under realistic law enforcement resource constraints. While previous hotspot policing experiments fix treatment and control hotspots throughout the experimental period, we use a novel experimental design to allow treatment and control hotspots to change dynamically over the course of the experiment. Our results show that ETAS models predict 1.4–2.2 times as much crime compared to a dedicated crime analyst using existing criminal intelligence and hotspot mapping practice. Police patrols using ETAS forecasts led to an average 7.4% reduction in crime volume as a function of patrol time, whereas patrols based upon analyst predictions showed no significant effect. Dynamic police patrol in response to ETAS crime forecasts can disrupt opportunities for crime and lead to real crime reductions.

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Crossref · 10.1080/01621459.2015.1077710

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  • It was estimated that using predictive hot spot maps for 31 minutes per day for each hot spot would save the LAPD $17,258,801 per year compared to traditional hot spot mapping, which would save half as much.

    “Based on these calculations, it was estimated that using predictive hot spot maps for 31 minutes per day for each hot spot would save the LAPD $17,258,801 per year vis-à-vis applying traditional hot spot mapping techniques by crime analysts, which would only save half as much (Mohler et al., 2015).”

    From ‘Led by Intelligence': A Scoping Review on the Experimental Evaluation of Intelligence-Led Policing (2024) · cites this paper as Mohler et al., 2015

    The Discussion projects $17,258,801 in annual savings for LAPD using ETAS with 31 minutes of patrol per hotspot per day, and $8,223,519 under analyst-selected conditions—less than half as much. But the $17,258,801 figure is calculated against no patrol, not against traditional analyst-selected hot spots, as the citing sentence implies. (LLM, conf=0.90)

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Research works printed but not linked: 1

  1. Roger E Kirk. Experimental design. Wiley Online Library.

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Authors
Mohler, G. O., Short, M. B., Malinowski, S., Johnson, M., Tita, G. E., Bertozzi, A. L., & Brantingham, P. J.
Affiliations
Santa Clara University (US)
Venue
Journal of the American Statistical Association
Published
2015-10-02
Volume
110
Issue
512
Pages
1399-1411
ISSN
  • 0162-1459 (ISSN-L)
  • 1537-274X
OpenAlex
W2232870322
Cited by
381
References
54
Citations by year
2026: 39 · 2025: 37 · 2024: 26 · 2023: 28 · 2022: 30 · 2021: 47 · 2020: 67 · 2019: 44 · 2018: 34 · 2017: 20 · 2016: 8 · 2015: 1
FWCI
69.65
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Statistical Association (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Science Foundation (0968309, 1343123)
  • Multidisciplinary University Research Initiative (W911NF‐11‐1‐0332, FA9550-10-1-0569)
  • Office of Naval Research (N000141210838, FA9550)
  • Air Force Office of Scientific Research (FA9550-, FA9550-10-1-, FA9550-10-1-0569)
  • Army Research Office (W911NF‐11‐1‐0332, W911NF, W911NF-11)
Topics
  • Social Sciences › Sociology and Political Science › Crime Patterns and Interventions
  • Social Sciences › Political Science and International Relations › Policing Practices and Perceptions
  • Social Sciences › Law › Criminal Justice and Penology
Keywords
predictive policing, epidemic-type aftershock sequence, crime prediction, crime hotspots, police patrol, crime reduction, hotspot mapping, criminal intelligence

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