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st: Re: collapse problem

From   "Nick Cox" <>
To   <>
Subject   st: Re: collapse problem
Date   Wed, 11 Sep 2002 13:41:41 +0100

Alejandro Riano wrote:

> I'm collapsing the standard deviation for a set of variables
> frequency):
> collapse (sd) er rer, by(country_name year)
> but if for example one country doesn't have data for all the year,
> getting a 0 instead of a missing value after doing the collapse, do
you know
> how can i solve this ?

but John Hennen could not reproduce this:

> Are you certain that there isn't at least one observation in the
> country for the year at issue?   Here is a counter-example using the
> dataset, showing that, when the variable of interest (mpg) is
missing in a cell,
> collapse returns sd = ., not zero.

[ snip ]

The resolution of this lies in the fact that Stata 7 was updated
on 2 August 2002 to fix this bug. See -help whatsnew- in any
Stata updated since then.

I guess that Alejandro has not updated, but John has.


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