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Comparing conventional and machine-learning approaches to risk assessment in domestic abuse cases

Grogger, Jeffrey, Ivandic, Ria and Kirchmaier, Thomas (2020) Comparing conventional and machine-learning approaches to risk assessment in domestic abuse cases. CEP Discussion Paper (1676). Centre for Economic Performance, LSE, London, UK.

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Abstract

We compare predictions from a conventional protocol-based approach to risk assessment with those based on a machine-learning approach. We first show that the conventional predictions are less accurate than, and have similar rates of negative prediction error as, a simple Bayes classifier that makes use only of the base failure rate. A random forest based on the underlying risk assessment questionnaire does better under the assumption that negative prediction errors are more costly than positive prediction errors. A random forest based on two-year criminal histories does better still. Indeed, adding the protocol-based features to the criminal histories adds almost nothing to the predictive adequacy of the model. We suggest using the predictions based on criminal histories to prioritize incoming calls for service, and devising a more sensitive instrument to distinguish true from false positives that result from this initial screening.

Item Type: Monograph (Discussion Paper)
Official URL: http://cep.lse.ac.uk/_new/publications/default.asp
Additional Information: © 2020 The Authors
Divisions: Economics
Centre for Economic Performance
Subjects: H Social Sciences > HV Social pathology. Social and public welfare. Criminology
Q Science > Q Science (General)
JEL classification: K - Law and Economics > K4 - Legal Procedure, the Legal System, and Illegal Behavior > K42 - Illegal Behavior and the Enforcement of Law
Date Deposited: 28 Apr 2020 08:33
Last Modified: 15 Sep 2020 23:06
URI: http://eprints.lse.ac.uk/id/eprint/104159

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