mzp3769 at yahoo.com
Thu Dec 9 19:03:47 CET 2004
yes, that's true. I forgot about two linear terms.
Does anybody know what order the coefficients come
or where to find the answer?
--- Peter Dalgaard <p.dalgaard at biostat.ku.dk> wrote:
> m p <mzp3769 at yahoo.com> writes:
> > Hello,
> > I am looking into description of surf.ls(spatial)
> > and see under value $beta - the coefficients.
> > When I use polynomial of degree 2 to fit surface
> > I expect to get 4 coefficients:
> > z = a_1 x^2 + a_2 xy + a_3 y^2 + a_4
> > What do beta really stand for and why do I get
> > $beta vector of length 6?
> Why do you expect a constant term but no linear
> terms? I'm too lazy to
> verify, but it sounds like that would be your
> missing 2 coefficients.
> O__ ---- Peter Dalgaard Blegdamsvej
> c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
> (*) \(*) -- University of Copenhagen Denmark
> Ph: (+45) 35327918
> ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)
> FAX: (+45) 35327907
More information about the R-help