A General Framework for the Estimation of Likelihood Ratios

A General Framework for the Estimation of Likelihood Ratios


This talk provides a very general framework for the estimation of likelihood ratios using similarity or dissimilarity scores resulting from a comparison of two patterns that overcome this deficiency for suitably chosen similarity measures. In such instances, the likelihood ratio estimate defined is in fact a good approximation for the classical likelihood ratio. Moreover, the quality of the approximation improves with increasing empirical information. This approach can be applied even when the data are numbers, vectors or attributes such as color. This presentation illustrates the approach using examples involving glass fragments, fingerprint comparisons, bullet casing marks and DNA profiles.


  • Steve Lund

Funding for this Forensic Technology Center of Excellence webinar has been provided by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice.

The opinions, findings, and conclusions or recommendations expressed in this webinar are those of the presenter(s) and do not necessarily reflect those of the U.S. Department of Justice.

Contact us at with any questions and subscribe to our newsletter for notifications.

Related Content

Data Exchange Practices of Medicolegal Death Investigation

Date December 2022 Overview The National Institute of Justice (NIJ)-in partnership with its Forensic Technology Center of Excellence (FTCOE) at RTI International and the National Center for Health Statistics, Centers for Disease Control and Prevention (CDC)-convened a virtual Medicolegal Death…

The Sentinel Role of Forensic Toxicology Laboratories to Identify and Act Upon Diverse Drug Threats by Addressing Toxicology and Economic Demands

Publication Forensic Science International: Synergy, September, 2022 Authors Jeri D. Ropero Miller | RTI International Lawrance D. Mullen | RTI International Paul J. Speaker | West Virginia University Introduction The societal costs from substance abuse are extensive and include treatment…