skip navigation


Abstract Database

Register for Latest Research

Stay Informed
Register with NCJRS to receive NCJRS's biweekly e-newsletter JUSTINFO and additional periodic emails from NCJRS and the NCJRS federal sponsors that highlight the latest research published or sponsored by the Office of Justice Programs.

NCJRS Abstract

To download this abstract, check the box next to the NCJ number then click the "Back To Search Results" link. Then, click the "Download" button on the Search Results page. Also see the Obtain Documents page for direction on how to access resources online, via mail, through interlibrary loans, or in a local library.


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): Forensic sciences
Index Term(s): DNA Typing; Mathematical modeling; NIJ grant-related documents; NIJ Resources; Victim identification
To cite this abstract, use the following link:

*A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's website is provided. Tell us how you use the NCJRS Library and Abstracts Database - send us your feedback.