[R] use of glm and cubic splines

[Thomas Lumley]

On Tue, 7 Oct 2003, Niel Hens wrote:

>
> When I fit a model like glm(gb~bs(age,df=6)), I obtain 7 estimates. Can
> anybody explain me where they stand for?

Well, yes and no.  They are coefficients of terms in the b-spline basis,
but that probably isn't very illuminating.

You can use termplot() on your fitted model to see the smooth curve that
has been fitted and is specified by these estimates. The only splines
where you get simple interpretations of individual coefficients are
linear splines.

	-thomas