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Re: st: Re: matching variable values


From   Gregor Franz <gfranz@uci.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: matching variable values
Date   Fri, 25 Aug 2006 15:16:43 -0700

Worked nicely!!

Thank you for your help. You saved me at least a day of headaches.

Greg

evan roberts wrote:
Gregor Franz asked how to attach a mother's height to children's records when the mothers were identified by an ID number

sort MomID
save <original-data>, replace
drop MomID
rename ID MomID
rename Height MomHeight
sort MomID
save <temporary-data-file>
use <original-data>, clear
merge MomID using <temporary-data-file>, nokeep

* You will get a message saying "variable MomID does not uniquely identify observations in the master data" because there are multiple children of each mother
* nokeep is necessary so that non-mothers records aren't added to the file attached to no-one.

assert _merge==1 | _merge==3



Dear Statlisters,

I would like to match the values of one variable to the values of
another variable and then create a third variable. Here is the basic setup:

ID MomID Height MomHeight
1 . 5 .
2 1 6 5
3 . 6 .
4 1 5.5 5 ...

MomHeight is the variable I want to create. It seems straightforward,
but I just can't come up with the right code.

Thank you for any pointers.

Greg
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