Thank you for the tips about the book, order it and waiting to come.
Question how to calculate variable representing cumulative value 'cumulad'
= [(total n pillmissed per patient at all visits) / (total n pillspres
at all visits)] * 100
example below, any tips?
patientid visitn pillspres pillmissed
cumulad
------------ ------- ------------
--------------- ------------
1001 1 30 2
1001 2 20 5
1001 6 50 1
1002 etc..
Thank you and best regards
ziad
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