Meta-analytically quantifying the reliability and biasability of forensic experts


Dror, Itiel E. and Rosenthal, Robert (2008) Meta-analytically quantifying the reliability and biasability of forensic experts. Journal of Forensic Sciences, 53, (4), 900-904. (doi:10.1111/j.1556-4029.2008.00762.x).

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Description/Abstract

In this paper we employ meta-analytic procedures and estimate effect sizes indexing the degree of reliability and biasability of forensic experts. The data are based on within-expert comparisons, whereby the same expert unknowingly makes judgments on the same data at different times. This allows us to take robust measurements and conduct analyses that compare variances within the same experts, and thus to carefully quantify
the degree of consistency and objectivity that underlie expert performance and decision making. To achieve consistency, experts must be reliable, at least in the very basic sense that an expert makes the same decision when the same data are presented in the same circumstances, and thus be consistent
with themselves. To achieve objectivity, experts must focus only on the data and ignore irrelevant information, and thus be unbiasable by extraneous context. The analyses show that experts are not totally reliable nor are they unbiasable. These findings are based on fingerprint experts decision making, but because this domain is so well established, they apply equally well (if not more) to all other less established forensic domains.

Item Type: Article
ISSNs: 0022-1198 (print)
Related URLs:
Subjects: Q Science > Q Science (General)
H Social Sciences > HA Statistics
B Philosophy. Psychology. Religion > BF Psychology
Divisions: University Structure - Pre August 2011 > School of Psychology > Division of Cognition
University Structure - Pre August 2011 > School of Psychology
ePrint ID: 59159
Date Deposited: 26 Aug 2008
Last Modified: 27 Mar 2014 18:41
Contact Email Address: id@ecs.soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/59159

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