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Biometric Performance Standards and Metrics

Here are some of the major Biometric KPIs:
The False Acceptance Rate is also referred to as FAR, or Type II Errors.  This performance standard reflects the probability that the biometric system will falsely recognize an impostor as a regular employee of your business, and grant them access to entry.

The False Rejection Rate is also referred to as FRR, or Type I Errors.  This performance standard describes the probability of a legitimate employee of your business being denied access to entry by the biometric system.

The Equal Error Rate reflects the probability of the FAR and the FRR being the same, or equal.  The Equal Error Rate is also known as the “Crossover Rate”.  This can be a misleading performance standard, and there are very few business applications which require the FAR and FRR to be equal.

For example, if you do not want the biometric system to allow any imposters, you would establish a threshold setting of 10, but this would allow for a higher probability of legitimate employees of being denied access.

However, if you absolutely do not want legitimate employees from being denied entry, you would set the threshold value at 55, but then this would allow for a higher probability of imposters to enter your place of business.  Thus, there is a tradeoff which you must accept.

We continue with more KPIs tomorrow.