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st: Clustered Data Format


From   john metcalfe <johnzmetcalfe@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Clustered Data Format
Date   Tue, 17 Mar 2009 17:37:57 -0700

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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