False Rejection Rate (FRR)

The probability that a biometric system will fail to identify an applicant, or verify the legitimate claimed identity of an applicant.

A statistic used to measure biometric performance when operating in the verification task. The percentage of times the system produces a false reject. A false reject occurs when an individual is not matched to his/her own existing biometric template. Example: John claims to be John, but the system incorrectly denies the claim. See also false non-match rate, type I error.