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st: matching variable values
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.
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