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False Alarm Rate

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The definition of a false alarm rate is the rate at which false alarms occur in relation to true alarms. In intruder detection, false alarms are defined as an alarm caused by non-intrusion events including environmental factors, authorised personnel, small animals and inanimate objects. True alarms are caused by the presence of an unauthorised object crossing the perimeter, an attempt to tamper with or hack the system or a device malfunction.

Nuisance Alarm Rate, NAR, Probability of false detection
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