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NCJ Number: 249335 Find in a Library
Title: Testing Likelihood Ratios Produced From Complex DNA Profiles
Journal: Forensic Science International - Genetics  Volume:16  Dated:May 2015  Pages:165-171
Author(s): Duncan Taylor; John Buckleton
Date Published: March 2015
Page Count: 7
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
Grant Number: 2011-DN-BX-K541
Document: HTML
Type: Report (Grant Sponsored); Report (Study/Research); Research (Applied/Empirical); Test/Measurement
Format: Article; Document (Online)
Language: English
Country: United States of America
Annotation: This study investigated a number of diagnostics in assessing the performance of a model (Hd true tests) for testing likelihood ratios produced from complex DNA profiles.
Abstract: The performance of any model used to analyze DNA profile evidence should be tested using simulation, large-scale validation studies based on ground-truth cases, or alignment with trends predicted by theory. The focus of the current work was the proportion of comparisons to non-contributors that yield a likelihood ratio (LR) higher than or equal to the likelihood ratio of a known contributor (LRPOI), designated as p, and the average LR for Hd true tests. Theory predicts that p should always be less than or equal to 1/LRPOI and hence the observation of this in any particular case is of limited use. A better diagnostic is the average LR for Hd true which should be near to 1. The current study tested the performance of a continuous interpretation model on nine DNA profiles of varying quality and complexity and verified the theoretical expectations. (Publisher abstract modified)
Main Term(s): Forensics/Forensic Sciences
Index Term(s): DNA Typing; Mathematical models; NIJ grant-related documents; NIJ Resources; Victim identification
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=271479

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