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st: st : creating a variable that counts frequencies of specific strings in a set of variables


From   "Jose Ignacio Pijoan Zubizarreta" <jipijoan@hcru.osakidetza.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: st : creating a variable that counts frequencies of specific strings in a set of variables
Date   Thu, 4 Nov 2004 14:13:25 +0100

Dear statalist supporters,
I apologize for asking a question about a problem that probably is not very
difficult to solve given the flexibility of Stata 8 but, after looking into
several FAQ I cannot manage to find out the solution to it.

I have got a database with several secondary diagnoses dia2-dia13 coded
according to the ICD9-CM code system (the icd9 commands work well in all of
them). Some people have a given diagnosis ( e.g. 43840) as dia2 whereas
other patients can have it included in dia3 or  dia4 an so forth. Each
individual can have only once a specific diagnostic code. What I would like
to get is a new variable that counts the frequencies of every single
diagnostic code across all patients and variables no matter in which
position it does appear. This way I would be able to say that there are n
different patients with a specific code ( e.g. 43840) out of the total
sample.

Thanks a lot for your attention

Jose I Pijoán
Unidad de Epidemiología Clínica
Hospital de Cruces
Tel: 946006452
Fax: 946006451
email: jipijoan@hcru.osakidetza.net

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