Folks,

This might be more of a basic stats problem... However, I am looking for the actual formula that Excel uses to compute =Norm.S.Inv for a given probability value (or percentile).

To clarify:
If I enter ".99" as a value, the formula returns 2.326...
This is essentially the "standard score" that corresponds to the 99th percentile of a normal distribution.

I am trying to verify the precise steps that Excel takes in this computation - what is the underlying formula?
I can find this for Norm.S.Dist in the Excel documentation (however, only for the non-cumulative version, not the cumulative one).
I appreciate if someone can help out on the Norm.S.Inv issue.

As