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st: RE: newbie if {} else {} question


From   Daniel Muller <d.mueller@agr.uni-goettingen.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: newbie if {} else {} question
Date   Thu, 19 Sep 2002 21:59:45 +0200

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: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]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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>
>

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