Source‐anchored, trace‐anchored, and general match score‐based likelihood ratios for camera device identification

Reinders, Stephanie; Guan, Yong Liang; Ommen, Danica M.; Newman, Jennifer

doi:10.1111/1556-4029.14991

Cited by 4 publications

(1 citation statement)

References 49 publications

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“…Although the SLR framework has shown promise in different areas of forensics (handwriting: [8,13,21,25], glass: [40,41], fingerprints: [20,28,35], speaker recognition: [19], ink: [36], MDMA tablets: [3,4], digital: [17], cameras: [42]), concerns have been raised regarding their behavior and use in forensic settings [32,34], and their evaluation has been the subject of extensive research in the literature [18,33]. Ishihara and Carne [22] summarize the benefits and shortcomings of using score-based methods; using a lower dimensional metric reduces the need for complex models, and simpler estimation procedures are required to estimate univariate conditional scores.…”

Section: Introductionmentioning

confidence: 99%

Ensemble learning for score likelihood ratios under the common source problem

Veneri

Ommen

2023

Statistical Analysis

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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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