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Re: st: RE: generate sum of variables & ignore missing


From   Andrea Bennett <mac.stata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: generate sum of variables & ignore missing
Date   Thu, 5 Jun 2008 14:41:49 +0200

Ahh, so I was looking at the wrong spot..

many thanks!

On Jun 5, 2008, at 2:25 PM, Martin Weiss wrote:

egen varD=rowtotal(varA - varC)

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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