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st: RE: combine data by groups
From
"Nick Cox" <[email protected]>
To
<[email protected]>
Subject
st: RE: combine data by groups
Date
Wed, 3 Mar 2010 20:06:21 -0000
-collapse- to maxima.
Advice: Don't flag questions as "easy".
Nick
[email protected]
G. Dai
hi all, this is an easy question,but somehow I can't figure it.
The data is like:
personid parentsid momlive dadlive
001 1 0
.
001 2 .
1
002 1 1
.
002 2 .
1
where personid and parentsid are person and her parents' id.
when parentid==1, we only record whether mom still live or not (momliv)
similarly
for parentid==2 and dadlive.
I want to change the data set to the following form
personid momlive dadlive
001 0 1
002 1 1
what is the best way to do this?
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