Friday, January 06, 2006

st: filling in missing string

Dear Statalist,

I have a dataset which looks like:

Product company molecule A X x1 A Y A Z x1 . . . . . . . . .

I have several examples of this throughout a large dataset. I want to fill in the missing "x1" under the molecule variable. Is there some way to do this using -by product- ?

Thank you! Terra

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