[amibroker] Code for CUMULATIVE normal distribution

["vlanschot" <vlanschot@xxxxxxxxx>]

I have various functions for normal distributions, but for some reason 
none seem to be able to replicate Excel's NORMDIST(x,mean,stdev,TRUE).

I've applied the Abramowitz & Stegun approximation to calculate the 
cumulative normal function. However, the pdf agrees with Excel's 
NORMDIST(x,mean,stdev,FALSE), but the cdf does not match its NORMDIST
(x,mean,stdev,TRUE).

I did read there have been criticisms expressed as to the accuracy of 
XL's approximations, but doubt this is applicable in this case.

Any suggestions appreciated.

PS



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