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False Alarm Ratio FAR = F / (H + F), i.e. the proportion of false alarms, given the event was forecast, which is one of the main parameters, together with the HR, in ROC diagrams.

Correct null = Z, the pr operation of correct forecasts that an event will not happen and does not actually happen. 

Note:

The False Alarm Rate (FR) should not be confused with the False Alarm Ratio (FAR).

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