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biometric as symmetric

What does it mean when we refer to a biometric as symmetric?
Determine the total number of scores that have been generated (L)?
How many imposter scores can be generated (L_0)? How many genuine (L_1)?
Plot the genuine and imposter match score distributions.
Generate a set of thresholds, determine the FAR and FRR at each threshold value. Plot the ROC Curve for your data (FRR vs. FAR and GAR vs. FAR).
Plot error rates relative to the threshold score and mark the point where the EER occurs. What is the EER of the system?
What threshold value would you select for a high-security application? What are the implications of your selection? Provide a justification for your response.
What threshold value would you select for a forensic application? What are the implications of your selection? Provide a justification for your response.
What is the AUC of the system?
What is the d-prime value for this system?
Summarize the rank-t identification rate for different values of t (for t<=10) using the Cumulative Match Characteristic (CMC) curve.

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