Brian Dunning's FileMaker Custom Functions

NormProb ( x )

Returns the Gaussian Probability Integral

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Dr. Ronald W. Satz   Dr. Ronald W. Satz
Transpower Corporation

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  Sample input:
NormProb ( 2 )
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

This custom function returns the Gaussian (Normal) probability integral (area under the Bell curve) to the left of x (including the area to the left of the y axis). This is the left-tail of the probability distribution. To get the right-tail (which is 1 - NormProb (x)), call the function with the argument -x.



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Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

Under construction. Email me your wish list for improvements.