Hi -
I have different "problem" like with the graphs with adressing all variables
when I use -collapse- .
What I want to do is basically:
collapse _all, by (id year)
i.e. just taking the mean of monthly observations per year and company. But
Stata tells me then:
id may not be both target and by()
So is there a way to keep all numerical variable by mean without specifying
them separately in the clist of -collapse- ?
Thanks.
- Tom
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