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Re: st: RE: a question on how to create a complex loop


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: a question on how to create a complex loop
Date   Thu, 9 Feb 2012 02:14:33 +0000

I don't know how literally Lim Lee means this suggestion, but note
that " " are illegal in this context and that you cannot use wildcards
in expressions.

The main idea is good and can be put in a single schematic statement:

egen y = total(varname == exp), by(id)

Nick

On Wed, Feb 8, 2012 at 11:34 PM, Lim Lee <lee.haklim@gmail.com> wrote:
> another way would be to create a binary variable for each criteria
> then creating another variable summing the criteria by patient using
> egen:
>
> 1) gen "x"=1 if diag1==icd?
> 2) egen "y"=total(x), by(id)
>
> best,
>
> Lim
>
> On Wed, Feb 8, 2012 at 11:22 AM, Reinhardt Jan Dietrich
> <jan.reinhardt@paranet.ch> wrote:
>> You could transpose the data into wide format using reshape (type: help reshape to see the code). Then you will get diagcateg1, diagcateg2, etc., i.e. a variable for each measurement point/occasion.
>> Then generate a new variable
>> Gen diagcat_count = diagcateg1 + diagcateg2
>> usw.
>>
>> Best
>> Jan
>>
>>
>> -----Original Message-----
>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Aluko Hope
>> Sent: Mittwoch, 8. Februar 2012 17:01
>> To: statalist@hsphsun2.harvard.edu
>> Subject: st: a question on how to create a complex loop
>>
>> Dear Stata list users,
>>
>> I am a health services researcher who is relatively new to STATA and I
>> am trying to count the number of times each patient satisfies a
>> particular criteria. I think I need to do this by creating a complex
>> loop but I am stuck as to how to go about it.
>>
>> The data is structured in the following manner:
>>
>> id diag1 diag2 diag3 visit# diagcateg1
>> 1    icd    icd    icd      3      1
>> 1    icd    icd    icd      3      1
>> 1    icd    icd    icd       3      1
>> 2    icd     icd   icd       4       0
>> 2    icd    icd    icd       4       0
>> 2    icd    icd    icd       4       0
>> 2    icd    icd    icd       4       0
>> 3    icd    icd    icd       2       1
>> 3    icd    icd    icd      2        1
>>
>> the icd refer to really icd9 and the diagcateg1 is a binary variable
>> that already classifies certain icd9 into categories.
>>
>> in words, what i want to do now is:
>> whenever diagcategory is 1, count the number of times per patient (id)
>> that there is a diag1 diag2 or diag3 that fit a particular criteria. i
>> would be happy with the total number per patient but would ideally
>> like to be able to describe the total number per patient per visit.

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