Biometrics -RATE

False Acceptance Rate (FAR)

Probability that the system incorrectly grants access to an unauthorized subject (false positive/type II error).

[Lower amount means stronger security but typically more user friction.]​

False Rejection Rate (FRR

Probability that the system incorrectly denies access to an authorized subject (false negative/type I error).

[Lower amount means better usability but often at the cost of higher FAR.]

Crossover Error Rate (CER) (aka Equal Error Rate, EER)

Is the error rate at the threshold where FAR and FRR intersect on a graph. At this operating point, the chance of wrongly accepting and wrongly rejecting are numerically the same.

[A lower amount indicates a more accurate biometric system, because you can tune it so that both FAR and FRR are relatively low compared to a system with a higher amount.]

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