On 7/27/06, Frank E Harrell Jr <[EMAIL PROTECTED]> wrote: > Tony Lachenbruch has written some about this, also see my book (it's web > page is biostat.mc.vanderbilt.edu/rms). I don't know about the power of > interaction tests, but for main effect tests in the absence of > interaction, the Wilcoxon test (a special case of PO model) has > efficiency of 3/pi compared to the t-test if normality holds. > > Other approaches: Cox PH model, avas, ace. My book covers these too.
Thanks, Frank, for the useful information. Paul ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
