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

[Pete St. Onge]

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
appreciated.

Many thanks,


-- 
Pete St. Onge
pete at seul.org

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