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st: Re: running the same do-file but getting different results

From   Kit Baum <>
Subject   st: Re: running the same do-file but getting different results
Date   Sun, 10 Feb 2008 11:17:45 -0500

This can occur because of a many-to-many merge (see that heading in my book or Statalist archives). Try using uniqmaster, uniqusing or unique options on the merges as appropriate for your data. You will probably find that where you expect uniqueness to apply in one dataset or the other it will fail.


Kit Baum, Boston College Economics and DIW Berlin
An Introduction to Modern Econometrics Using Stata:

On Feb 10, 2008, at 2:33 AM, statalist-digest wrote:

i have just noticed the following problem. I start Stata by clicking
on the .dta file and run the series of do files and get some results.
Now in the same session of Stata if I use -clear- and then read the
data set again with -use- command and run the same set of do files I
get some difference in results. The difference in result is mostly
noticed for the -count- commands (with some complicated -if-
conditions). Since the do files are large, I am not printing them in
this mail. I would appreciate if some of you could throw some light on
the problem if at least from some generic point. I am saying "from
some generic point" because I can understand that with the above
information it will be difficult to give a specific solution to my
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