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Binary Classification : Compute PPV, NPV and Prevalence from Accuracy, Sensitivity and Specificity

Accuracy	:
Sensitivity	:
Specificity	:
Prevalence	:		P = (Ac - Sp) / (Se - Sp)
PPV	:		PPV = (Se * P) / ( (Se * P) + (1 - Sp) * (1 - P))
NPV	:		NPV = (Sp * ( 1 - P)) / ( (Sp * ( 1 - P)) + (1 - Se) * P)