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On the meaning of the likelihood ratio: Is a large number always an indication of strength of evidence?  Hinda Haned, Guro Dørum, Thore Egeland, Peter.

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Presentation on theme: "On the meaning of the likelihood ratio: Is a large number always an indication of strength of evidence?  Hinda Haned, Guro Dørum, Thore Egeland, Peter."— Presentation transcript:

1 On the meaning of the likelihood ratio: Is a large number always an indication of strength of evidence?  Hinda Haned, Guro Dørum, Thore Egeland, Peter Gill  Forensic Science International: Genetics Supplement Series  Volume 4, Issue 1, Pages e176-e177 (January 2013) DOI: /j.fsigss Copyright © Terms and Conditions

2 Fig. 1 A case example: Crime-stain epg with allele designations. There are two suspects S1 and S2. Shaded alleles are shared with victim and red alleles are found in the victim. Bracketed alleles are below detection threshold but appear distinct. Forensic Science International: Genetics Supplement Series 2013 4, e176-e177DOI: ( /j.fsigss ) Copyright © Terms and Conditions

3 Fig. 2 Results of non-contributor tests where S1 and S2 are respectively replaced by 1000 random (R) genotypes, showing the observed rLR (random likelihood ratio); the one percentile (1%rLR); median (50%rLR) and 99 (99%rLR) percentile random man rLRs. In (A) the tests are all negative log10; in (B) the distribution of rLRs is either neutral or positive log10. Forensic Science International: Genetics Supplement Series 2013 4, e176-e177DOI: ( /j.fsigss ) Copyright © Terms and Conditions


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