Dear Max, I'm guessing that you're actually using scatter3d() in the Rcmdr package rather than scatterplot3d(), since the latter, I believe, doesn't fit regression surfaces.
If I'm right, then as it says in ?scatter3d, the smooth surface is fit by the gam() function in the mgcv package using a smoothing spline and there is no explicit equation to examine. See ?gam for more information. I hope this helps, John -------------------------------- John Fox, Professor Department of Sociology McMaster University Hamilton, Ontario, Canada L8S 4M4 905-525-9140x23604 http://socserv.mcmaster.ca/jfox > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > project.org] On Behalf Of Max > Sent: December-18-07 2:02 PM > To: [EMAIL PROTECTED] > Subject: [R] Scatterplot3d model reporting question > > I've used the scatterplot3d function to graph some data and had it > graph a "smooth" fit. Is there a way to actualy find out the function > of the surface? I've looked through the help and figured out how to get > it to report the following: > > Family: gaussian > Link function: identity > > Formula: > y ~ s(x, z) > > Parametric coefficients: > Estimate Std. Error t value Pr(>|t|) > (Intercept) 0.20750 0.01223 16.97 <2e-16 *** > --- > Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 > > Approximate significance of smooth terms: > edf Est.rank F p-value > s(x,z) 8.403 17 9.729 1.76e-14 *** > --- > Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 > > R-sq.(adj) = 0.684 Deviance explained = 70.9% > GCV score = 0.017692 Scale est. = 0.016151 n = 108 > > But I'm still not really sure what I'm looking at, either that or > "smooth" means something different than I thought. Any help would be > great! > > thanks, > > -Max > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.