Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: Extension of -stptime- or -strate- commands to test 3 or more rates are equal
From
"Weichle, Thomas" <[email protected]>
To
<[email protected]>
Subject
st: Extension of -stptime- or -strate- commands to test 3 or more rates are equal
Date
Fri, 12 Aug 2011 14:58:17 -0500
Hi Statalisters,
-stptime- and -strate- will both calculate the rate as the number of
failures divided by the person-time, by different levels of an
explanatory variable. I'm using an explanatory variable with 3 levels.
stptime if stage_ajcc5 == "I", by(dual_cc_3) dd(2) per(100)
strate dual_cc_3 if stage_ajcc5 == "I", per(100)
Both of these produce identical rate calculations.
I would like to do a global test that all 3 incidence rates are equal
(H0: IR1=IR2=IR3). However, this does not appear to be possible using
these commands. Also, the -stir- command does not allow for an exposure
variable that is not a 0/1 variable. Does anyone have any experience
with performing a test like this or calculating the test external from
the command?
Tom Weichle
Math Statistician
Center for Management of Complex Chronic Care (CMC3)
Hines VA Hospital, Bldg 1, C202
708-202-8387 ext. 24261
[email protected]
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/