The evidential value in the DNA database search controversy and the two-stain problem |
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Authors: | Meester Ronald Sjerps Marjan |
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Institution: | Divisie Wiskunde, Faculteit der Exacte Wetenschappen, Vrije Universiteit, De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands. rmeester@cs.vu.nl |
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Abstract: | Summary . Does the evidential strength of a DNA match depend on whether the suspect was identified through database search or through other evidence (“probable cause”)? In Balding and Donnelly (1995, Journal of the Royal Statistical Society, Series A 158, 21–53) and elsewhere, it has been argued that the evidential strength is slightly larger in a database search case than in a probable cause case, while Stockmarr (1999 , Biometrics 55, 671–677) reached the opposite conclusion. Both these approaches use likelihood ratios. By making an excursion to a similar problem, the two‐stain problem, we argue in this article that there are certain fundamental difficulties with the use of a likelihood ratio, which can be avoided by concentrating on the posterior odds. This approach helps resolving the above‐mentioned conflict. |
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Keywords: | Database search DNA Likelihood ratio Posterior odds Two-stain problem |
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