Dear Statalist,
Forgive me if this is too elementary of a question, but I have a
longitudinal data set in Format A below upon which I would like to
perform linear mixed effects regression (y on days_b grouped by
patientid). Is there an easy way to convert the data to Format B?
Many thanks,
John
Format A: (current)
patientid y_first y_second days_betw
299729 0 0 64
295861 0.17 0.08 63
292641 0.15 0.5 69
Format B: (desired)
patientid y days_betw
299729 0 0
299729 0 64
295861 0.17 0
295861 0.08 63
292641 0.15 0
292641 0.5 69
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