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# st: Zcalc - with different sd in two groups

 From Lars Folkestad To "statalist@hsphsun2.harvard.edu" Subject st: Zcalc - with different sd in two groups Date Thu, 14 Jul 2011 13:46:35 +0200

```Dear Stata list

I have two groups with two means and different standard deviations (SD), and the latter is the problem.
Using the zcalc program, se description below, i can calculate a z-score between the groups if the SD was the same in both groups.

How do i calculate the normal value (z-score) for a measurement method when the groups have different means?

Thank you
Lars

The zcalc option from findit:
---------------------------
Description
-----------

zcalc is a silly little program that computes z-scores.
If you provide the arguements x mean sd, zcalc
computes a z-score for observations.  If you
provide the arguements mean mu sd n in the arguement
list zclac computes a z-score for sample means.

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```