THREAT SCORE
TS = Ac / (Af +Ao -Ac)
Ac = Area correct
Af = Area forecast
Ao = Area observed
Af Ao Af = Ao, Ac = 0
Threat score = 0.00
Af Ao Af = Ao, Ac = 1/2 Af
Threat score = 0.33
Ac
Af = Ao = Ac
Threat score = 1.00
BIAS=Af/Ao
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