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An empirical estimate of the precision of likelihood ratios from a forensic-voice-comparison system
Morrison, Geoffrey
;
Zhang, Cuiling
;
Rose, Philip
In: Forensic Science International (2015)
Abstract:
An acoustic-phonetic forensic-voice-comparison system was constructed using the time-averaged formant values of tokens of 61 male Chinese speakers' /i/, /e/, and /a/ monophthongs as input. Likelihood ratios were calculated using a multivariate kernel density formula. A separate set of likelihood ratios was calculated for each vowel phoneme, and these were then fused and calibrated using linear logistic regression. The system was tested via cross-validation. The validity and reliability of the results were assessed using the log-likelihood-ratio-cost function (Cllr, a measure of accuracy) and an empirical estimate of the credible interval for the likelihood ratios from different-speaker comparisons (a measure of precision). The credible interval was calculated on the basis of two independent pairs of samples for each different-speaker comparison pair.
Keyword:
acoustic phonetic forensic voice comparison system
;
Adul Accuracy
;
article
;
calculation
;
Chinese
;
Credible interval
;
forensic science
;
Forensic voice comparison
;
human
;
Keywords: accuracy
;
likehood ratio
;
logistic regression analysis
;
phoneme
;
Precision
;
priority journal
;
reliability
;
speech
;
statistical analysis
;
validity
;
voice
URL:
http://hdl.handle.net/1885/57680
https://doi.org/10.1016/j.forsciint.2010.11.001
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