On Thu, 4 Sep 2003, Paul, David A wrote: > I am one of only 5 or 6 people in my organization making the > effort to include R/Splus as an analysis tool in everyday work - > the rest of my colleagues use SAS exclusively. > > Today, one of them made the assertion that he believes the > numerical algorithms in SAS are superior to those in Splus > and R -- ie, optimization routines are faster in SAS, the SAS > Institute has teams of excellent numerical analysts that > ensure its superiority to anything freely available, PROC > NLMIXED is more flexible than nlme( ) in the sense that it > allows a much wider array of error structures than can be used > in R/Splus, &etc.
While I don't subscribe to the general theory, they have a point about PROC NLMIXED. It does more accurate calculations for generalised linear mixed models than are currently available in R/S-PLUS, and for logistic random effects models the difference can sometimes be large enought to matter. -thomas ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help