st: How to balance an unbalanced panel data set

[Christian Bustamante <cdeb77@gmail.com>]

Hi Statalisters,

I have a very unbalanced panel data set, composed for a lot of panel
and 12 years. I'm interested in "balance" this panel, keeping only the
panel tha have information for a set of variables in all the period.
How can I do that?

Thanks

-- 
CdeB
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