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st: Gap in treatment

From   Gary Walker <>
Subject   st: Gap in treatment
Date   Sat, 11 Jul 2009 14:44:42 -0700

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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