[R] surf.ls

m p mzp3769 at yahoo.com
Thu Dec 9 18:11:31 CET 2004

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?


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