I'm also not an expert and don't know how to accomplish that with an
if-loop.
However, another possibility is:
. egen ascertgp=group(probip promig)
Daniel
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Richard
> Herrell
> Sent: Thursday, September 19, 2002 9:27 PM
> To: statalist
> Subject: st: newbie if {} else {} question
>
>
> I've just started learning Stata syntax after long years of SAS use and am
> completely stumped by a result. I want to create a new 4-level variable
> (ascertgp) based on the crosstabulation of 2 dichotomous variables (probip
> and promig). This is the syntax I wrote:
>
> if probip==1 & promig==1 {
> gen ascertgp=1
> }
> else if probip==0 & promig==1 {
> gen ascertgp=2
> }
> else if probip==1 & promig==0 {
> gen ascertgp=3
> }
> else if probip==0 & promig==0 {
> gen ascertgp=4
> }
>
> When I run tab1 ascertgp I get a value of 3 for every observation. (I
> know what the 4 frequencies should be from the crosstab.) I must be doing
> something very obviously wrong, but can see what it is.
>
>
> *
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> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
>
*
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