st: restoring dataset

[Choudry T Shehzad <C.T.Shehzad@rug.nl>]

Dear Statalisters:

I have a question. After using the command "keep" or "drop" and running
an analysis, how can i ask stata to use all the data again. The problem
starts when I run command e.g. for a subset of years and later I want to
run command on whole years in the same do file again.

Thanks,

Shehzad
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