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st: confidence intervals for median differences


From   "Seidel, Kristy D" <kseidel@fhcrc.org>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: confidence intervals for median differences
Date   Fri, 4 Feb 2011 14:19:04 -0800

Hello Statalist,

In the past I have used the "cendif" module to obtain confidence
intervals for the median difference between two groups. The last time I
successfully used cendif was with Stata 9.  I've got Stata 11 now, and
the cendif module doesn't seem to work with it.  I tried installing the
latest version of cendif that I could find (from SJ-6-4  snp15_7), but
it still will not run properly. I tried specifying Version 9 first, but
that didn't help.  


Here's what comes up in the results window: 

. cendif cheops_first, tdist by(group)  centile(50)
Y-variable: cheops_first
Grouped by: group (RANDMETH)
Group numbers:

           RANDMETH |      Freq.     Percent        Cum.
--------------------+-----------------------------------
            Group A |         56       49.12       49.12
            Group B |         58       50.88      100.00
--------------------+-----------------------------------
              Total |        114      100.00

       tidotforsomersd():  3499  tidottree() not found
                 <istmt>:     -  function returned error
Mata run-time error
r(3499);


Have other people experienced this problem? Does anyone know of a
solution?

Thanks,

Kristy 


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