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Re: st: generate sum of variables & ignore missing
use egen with the rowtotal option; e.g.
egen varD=rowtotal(varA varB varC)
Rich
Andrea Bennett wrote:
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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