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Re: st: How to count event using condition over time


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to count event using condition over time
Date   Wed, 29 Aug 2007 10:54:25 +0100 (BST)

--- Ziad El-Khatib <Ziad.El-Khatib@ki.se> wrote:
> I dataset, looking at patients at different time points (week1,
> week2, week3 .... week12) and measuring their adherence.
> I want to count patients who did report poor adherence for at least
> one time, i.e. did report adherence above 5 for at least once
> during the 12 weeks of observation.

*---------- begin example ------------
/* generate some data */
drop _all
set obs 100
forvalues i = 1/12 {
	gen week`i' = ceil(6*uniform())
}

/*at least once poor adherence*/
gen poor = 0
forvalues i = 1/12 {
	replace poor = 1 if week`i' > 5
}

/*count number of poor adherence patients*/
count if poor == 1
*--------------- end example -------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )

Hope this helps,
Maarten



-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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