Method note: FlashID, FBI 100 and sample design underpin random-match estimates
Presenters described the sample design ("FBI 100" convenience sample, Alabama samples), FlashID/Syometrics processing, and use of Pearson chi-square statistics to estimate error rates, cautioning short words and printing-versus-cursive differences limit some automated approaches.
The full story
Presenters described the datasets and computational methods used to estimate random match and non-match probabilities. The study used a convenience sample called the "FBI 100": 100 volunteer writers who each provided five copies of a modified London-letter specimen processed by Syometrics/FlashID. The team also used Alabama-word samples and noted that short words such as "Alabama" pose challenges for some algorithms because they contain few characters, requiring a specialized ("boutique") algorithm in that case.
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