Dear Stata-Listers
Apologies if this has been previously received (yesterday), but I could not
see it on the Stata-list archives and I think I was dis-connected at the
time of sending:
There are numerous entries in “search” for interactions in Stata, but
somewhat surprisingly, none (including “findit”) for the “Gail-Simon” test
for qualitative interactions (M. Gail and R. Simon. Testing for Qualitative
Interactions between Treatment Effects and Patient Subsets. Biometrics 41
(2):361-372, 1985).
This test has been used frequently, albeit with some degree of controversy,
in the medical trial literature and has also been featured in the excellent
text: A Dmitrienko, Geert Molenberghs, C. Chuang-Stein, and W. W. Offen.
Analysis of clinical trials using SAS: A practical guide, Cary, NC:SAS
Institute Inc., 2005.
Not having access to SAS (!!), I wonder if anyone has coded this test in
Stata?
Thanks in advance
John Moran
Department of Intensive Care Medicine
The Queen Elizabeth Hospital
28 Woodville Road
Woodville SA
Australia
Tel 61 08 8222 6463
Fax 61 08 8222 6045
Mobile 0414 267 529
E-mail: john.moran@adelaide.edu.au
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
