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st: RE: generate sum of variables & ignore missing


From   "Martin Weiss" <martin.weiss@uni-tuebingen.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: generate sum of variables & ignore missing
Date   Thu, 5 Jun 2008 14:25:53 +0200

egen varD=rowtotal(varA - varC)

Martin Weiss
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Diplom-Kaufmann Martin Weiss
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-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Andrea Bennett
Sent: Thursday, June 05, 2008 2:24 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: generate sum of variables & ignore missing

Hi,

I guess this is an easy task for somebody more experienced. I have 3  
columns (varA, varB, varC) containing dummy variables (0, 1, missing  
values "."). I would like to generate "varD" the sum of each row, e.g.  
if varA==1 varB==0 varC==1 I should have varD==2. This works clearly  
fine when there are no missing values (varD= varA + varB + varC). But  
is there an easy way to let Stata read a missing value as "0" so that  
varA==1 varB==. varC==1 would result in varD==2 (without actually  
replacing the missing values with "0")? I am trying to get it to work  
with -missing()- but so far have not succeeded.

Many thanks for your consideration,

Andrea
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