Comparing Type 2 regressions Was: [R] Ancova in R?

Pete St. Onge pete at
Wed Feb 9 16:11:20 CET 2000

For starters, thanks to everyone who responsded to my previous request for
help about Type 2 regression. 

> > I see the R-sm has the ancova thing happening, but I kind of doubt that
> > what I'm trying to do is "smoothing"...
> And what is R-sm? An obscure reference to the sm package on CRAN,
> perhaps?   There is a function sm.ancova in that package, and that
> compares a set of nonparametric regression curves.

To follow this up with the other thread, is there a way to compare two or
more lines based on Type 2 regression techniques (or lines based on the 1st
principal component) to see if they are significantly different from each
other with respect to their slopes and intercepts?

This is not a subject that I've seen dealt with in any of the stats books
that I've read, and pointers to other references that do would be

Many thanks,

Pete St. Onge
pete at

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