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st: reading dataset if


From   Emmanuelle Lavaine <Emmanuelle.Lavaine@univ-paris1.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: reading dataset if
Date   Wed, 21 Sep 2011 23:46:41 +0200

Dear Statalisters,

I have a huge dataset and I would like to get rid of some observations
when opening it.
I want to open my dataset only if the first character corresponds to
'I' or 'J'
for the string variable 'diagp', I have something like:

diagp
I236
I256
I52
J46
J856
H343
etc..

I tried:
   use 'dataset.dta' if diagp=="[I-J]*"

But I am doing something wrong and I can't figurate it out.
Thanks for your help

Emma




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