st: matching variable values

[Gregor Franz <gfranz@uci.edu>]

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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