st: Connecting baseline dataset to visit dataset

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

Dear STATAlister
how is it possible to connect baseline dataset (study ID mentioned
once) to another dataset for the same patients, where we did collect
data for them at different time points?

my intention is to run correlation analysis between patients
backgrounds and outcome.


thank you and best regards
ziad
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