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Re: st: _00001 already define error using egen xx=group()
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: _00001 already define error using egen xx=group()
Date
Thu, 29 Sep 2011 11:45:29 +0100
Thanks for the reply. I didn't provide a work-around, just commentary
and some questions.
However, you do not, I think, quite address the key question raised
by Paul, which is whether previously saved temporary variables are the
cause of the problem. You can check this easily by
d __*
before you call -egen-. If you have such variables, you should
-rename- them with permanent names (-search renvars- also for an extra
utility).
The satisfactory test with the auto dataset is consistent with Paul's
idea and indicates that your -egen- code is not corrupted but it
doesn't amount to proof.
My guess is that upgrading to Stata 12, although naturally a good idea
otherwise, is going to make no difference, and that this problem would
recur in Stata 12 in similar circumstances.
Nick
On Thu, Sep 29, 2011 at 11:24 AM, Barry Quinn <[email protected]> wrote:
> Thanks for swift response to this and apologies for late reply.
>
> Firstly I am using Stata 11.2 which is up to date.
>
> Nick:
> Thanks for the work around for my problem
> Your test using auto data doesn't produce the above error.
> Here are the results from the command you mentioned.
> . su insample oneyear
>
> Variable | Obs Mean Std. Dev. Min Max
> -------------+--------------------------------------------------------
> insample | 1525 .6557377 .475283 0 1
> oneyear | 1525 .4754098 .4995588 0 1
>
> Paul:
> Thanks for your work around, which does work.
> The problem being that I have estimated average treatment effects for 8 outcome variables across 10 different samples.
> Which unfortunately gives me 80 datasets to first and second call in stata.
>
> I agree with Nick that this is a worrying problem and I have also tested it on an older version of stata (11.1) with the same result.
>
> Budgeting constraints mean I cannot get my school to purchase stata 12 licences at present.
>
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