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st: RE: Gap in treatment


From   PEREZ PEREZ JORGE EDUARDO <perez.jorge@ur.edu.co>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Gap in treatment
Date   Sat, 11 Jul 2009 22:11:55 +0000

Make sure your date has the proper format (i.e %td), then:

sort patient date
by patient: gen gap=date[_n]-date[_n-1]
by patient: egen maxgap=max(gap)

Hope this helps,
_________________________
Jorge Eduardo Pérez Pérez

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Gary Walker
Sent: sábado, 11 de julio de 2009 04:45 p.m.
To: statalist@hsphsun2.harvard.edu
Subject: st: Gap in treatment

I have a dataset of each administration of chemotherapy for a number
of patients, i.e.:

Patient     date      chemo drug
A          7/1/2009    X
A         4/1/2009    Y
A          1/1/2008    X
B          7/1/2009    Z
B          1/1/2008    X
C          7/1/2009    Y
C          4/1/2009    X
C          1/1/2008    Z

I want to calculate the biggest gap in treatment for each patient. In
other words, what was the maximum amount of time between treatments
for each patients.  Any ideas on how to do this?
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