st: Questiion: for with by

["Andrea Mascotto" <andrea.mascotto@ne.su.se>]

Hi all,

As far as I know, with panel data, the command "for" does not allow the use 
of "by".
How can I work with many variables using something like "for" and, at the 
same time, get things done by each cross section? Is there a way?

Thanks,
Andrea 

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