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False Acceptance Ratio (FAR)

Definition - What does False Acceptance Ratio (FAR) mean?

The false acceptance ratio (FAR) is a unit used to measure the average number of false acceptances within a biometric security system. It measures and evaluates the efficiency and accuracy of a biometric system by determining the rate at which unauthorized or illegitimate users are verified on a particular system.

FAR is also known as false acceptance rate or type II error rate/ratio.

Techopedia explains False Acceptance Ratio (FAR)

FAR primarily helps determine the accuracy level of a biometric security system. FAR is calculated by dividing the number of false acceptances by the number of identification attempts. For example, if the number of false acceptances is 100 out of a total of 1,000 identification attempts, the FAR is 0.10. This means that the biometric system will allow 10 percent, or 1 out of each 10 false attempts, to access the system.

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