Ensemble learning for score likelihood ratios under the common source problem

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Date
2023-08-04
Authors
Veneri, Federico
Ommen, Danica M.
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Wiley Periodicals LLC
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Center for Statistics and Applications in Forensic EvidenceStatistics
Abstract
Machine learning-based score likelihood ratios (SLRs) have emerged as alternatives to traditional likelihood ratios and Bayes factors to quantify the value of evidence when contrasting two opposing propositions. When developing a conventional statistical model is infeasible, machine learning can be used to construct a (dis)similarity score for complex data and estimate the ratio of the conditional distributions of the scores. Under the common source problem, the opposing propositions address if two items come from the same source. To develop their SLRs, practitioners create datasets using pairwise comparisons from a background population sample. These comparisons result in a complex dependence structure that violates the independence assumption made by many popular methods. We propose a resampling step to remedy this lack of independence and an ensemble approach to enhance the performance of SLR systems. First, we introduce a source-aware resampling plan to construct datasets where the independence assumption is met. Using these newly created sets, we train multiple base SLRs and aggregate their outputs into a final value of evidence. Our experimental results show that this ensemble SLR can outperform a traditional SLR approach in terms of the rate of misleading evidence and discriminatory power and present more consistent results.
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This article is published as F. Veneri and D. M. Ommen, Ensemble learning for score likelihood ratios under the common source problem, Stat. Anal. Data Min.: ASA Data Sci. J. 16 (2023), 528–546. https://doi.org/10.1002/sam.11637. © 2023 The Authors. Posted with permission of CSAFE.

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
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