Function Definition

Calculates the cumulative normal distribution of x, which in the BlackScholes option pricing environment will take the form of d1 or d2. 

The value returned by oCumNorm(x) is the probability that a variable will be less than x.

Model Definition 



Model Approximation 
The oCumNorm( ) function uses a numerical approximation of the model definition which produces values of N(x) within six decimal places of the true value. The approximation is: 




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