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Re: st: Macro and Loop


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Macro and Loop
Date   Mon, 8 Sep 2008 17:45:24 +0100 (BST)

--- Ying Huang <hying@mail.med.upenn.edu> wrote:
> I have 24 indicator variables (1/0) to indicate insurance coverage in
> 24 monthes. For example, if the survey is in 1997, then the survey
> month refer to Jan to Dec of 1997, and those 24 variables show
> insurance coverage for each month in 97 and 98.
> 
> The variable I want to create is again a 1/0 variable, say call it 
> "insurance". Starting from the survey month, if any of the following
> 12 insurance coverage indicators = yes, then insurance =1; otherwise 
> insurance =0.

say that the indicotor variables are called insured1 till insured24,
then I would type:
egen insured = rowtotal(insured1-insured12)
replace insured = insured >0 if insured < .

You may need to think a bit on how you treat missing values (-rowtotal-
treats a missing value by default as 0)

Hope this helps,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room N515

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


      
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