st: mean level

["Ziad El-Khatib" <Ziad.El-Khatib@ki.se>]

Dear STATA lister
how is it possible to produce table with mean level of continuous var
(rna) at every time point (visit)?

example

visit         mean rna
----------------------------
2                500
4                600
6                300

etc..


Thank you and best regards
ziad
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