I would appreciate any suggestions on which function to use to write subsequent
functions analysing combinations of treatments.
This refers to experimental trials of medical treatments. I want to write
routines to analyse various comparisons (combinations)
So .... if 5 treatments are available (t01, t02, t03, t04 and t05) I want to
write a general routine that works out all possible combinations, without
repeats. The other complication is that I want to be able to designate any one
of the treatments as the common comparator such that all other treatments are
compared to it.
For example, if I designate t04 as the common comparator then I want it to give
me back some sort of vector or matrix with results
t01, t04
t02, t04
t03, t04
t05, t04
In my research I've found functions such as combinations and permutations in
gtools, and also choose(). I suspect these could be coerced to provide the
correct output but I may be missing a specific, or more flexible package that
will produce this.
Any suggestions most welcome.
Thanks
Jim
===============================
Dr. Jim Maas
University of East Anglia
Norwich, UK
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org 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.
