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Jacob Cohen (1994)
The earth is round (p < .05)American Psychologist, 49
J. Gill
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D. Rossmo (2009)
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Jacob Cohen, Patricia Cohen, J. Rabkin, Raymond Katzell, Donald Klein, Paul Meehl, David Bakan, William Rozeboom, Robyn Dawes, Howard Wainer, Robert Rosenthal, Gerd Gigerenzer, Michael Oakes, Leland Wilkinson
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Mindless statistics
Purpose – The purpose of this paper is to discuss and demonstrate “best practices” for creating quantitative behavioural investigative advice (i.e. statements to assist police with psychological and behavioural aspects of investigations) where complex statistical modelling is not available. Design/methodology/approach – Using a sample of 361 serial stranger sexual offenses and a cross‐validation approach, the paper demonstrates prediction of offender characteristics using base rates and using Bayes’ Theorem. The paper predicts four dichotomous offender characteristic variables, first using simple base rates, then using Bayes’ Theorem with 16 categorical crime scene variable predictors. Findings – Both methods consistently predict better than chance. By incorporating more information, analyses based on Bayes’ Theorem (74.6 per cent accurate) predict with 11.1 per cent more accuracy overall than analyses based on base rates (63.5 per cent accurate), and provide improved advising estimates in line with best practices. Originality/value – The study demonstrates how useful predictions of offender characteristics can be acquired from crime information without large (i.e. >500 cases) data sets or “trained” statistical models. Advising statements are constructed for discussion, and results are discussed in terms of the pragmatic usefulness of the methods for police investigations.
Policing: An International Journal of Police Strategies and Management – Emerald Publishing
Published: Mar 11, 2014
Keywords: Decision making; Bayesian methods; Intelligence‐led policing; Investigation; Offender characteristics
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