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Re: st: loop for z-score

From   Nick Cox <>
To   "" <>
Subject   Re: st: loop for z-score
Date   Sat, 28 Dec 2013 18:16:04 +0000


-egen-'s -mean()- and -sd()- functions support operations -by:-, so
your own standardization should be easy using those for the basic
calculations. I can't see that a loop is needed.

On the other hand, I don't know what you mean by "z score 3".


On 28 December 2013 17:15, Almazea Fatima <>

> I have a variable "quantity", I want to standardize(z score 3) it by "region" and "season"
> I used following for this purpose:
> egen z=std(quantity)
> Problem is it do not have "by" option, so I want to do it by loop..
> Can anybody help me to create loop for it???????
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