【NormalStandardCumDen】
[code][LegacyColorValue = TRUE];Inputs: Price(numericsimple);
Variables: MyT(0), MyZ(0), Density(0), TwoPiRoot(2.506628275), p(.2316419), b1(.319381530),
b2(.356563782), b3(1.781477937), b4(1.821255978), b5(1.330274429);
MyT = 1/ (1 + p * AbsValue(Price));
MyZ = ExpValue(-Square( Price ) * .5)/ TwoPiRoot;
Density = 1 - MyZ * ((((( b5 * MyT - b4) * MyT + b3) * MyT - b2) * MyT + b1) * MyT ) ;
if Price < 0 then
Density = 1- Density;
NormalStandardCumDen = Density;
[/code]
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