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Re: st: Linking a patient file with an event file


From   Lisa Cook <hlthsrvcsphd@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Linking a patient file with an event file
Date   Sun, 3 Mar 2013 15:36:46 -0500

Hi Carl,

I'm not at the University of Calgary, but thanks for the offer! I
really appreciate the help.

Using the code you suggest, I get a variable that takes the values
edcount = 1 for the first visit, edcount = 2 for the second, edcount =
3 for the third, and so on. Thus, when I reshape, I get an error if I
try to leave the edcount variable off my list of variables, because
it's not a constant value. Is there a way to just keep the highest
value of edcount for each person?

Lisa

On Sun, Mar 3, 2013 at 3:01 PM, Carl Severson <carlseverson@gmail.com> wrote:
> Hey Lisa, glad it helped.
>
> I think there is an easier solution than a foreach loop. Will this
> accomplish what you want?
>
>      by id2013: gen edcount = _n
>      by id2013: gen visit = _n
>      reshape wide visitVariable, i(id2013) j(visit)
>
> This should give you a single line per person, with a variable that
> has the number of visits per person.
>
> Out of curiosity, what kind of models are you running?
>
> Hope that helps.
>
> p.s. In the rare, rare chance that you are located at the University
> of Calgary, I'd be happy to sit down with you in person and help with
> you data management issues.
>
> Carl
>
> On Sun, Mar 3, 2013 at 12:30 PM, Lisa Cook <hlthsrvcsphd@gmail.com> wrote:
>> Thank you, Carl.
>>
>> The code you suggested worked, but once the reshaping is done, I no
>> longer have an edcount variable (it turns into edcount1, edcount2,
>> edcount3, etc.). I thought maybe I could use a macro to replace all
>> the values of edcount with 1 if nonmissing and 0 if missing, then sum
>> them to get a new count variable. I thought I would try doing it one
>> step at a time, since I'm inexperienced with macros.
>>
>> foreach var of varlist `edcount?' {
>>   replace `var' = 1 if `var' !=.
>> }
>>
>> This results in the error "varlist required". Any ideas?
>>
>> Thanks!
>> Lisa
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