[R] GAM plots

[Simon Wood]

Are you using mgcv:::gam? To get plot data suitable for making plots of smooth 
effects, you probably need to use `predict.gam' to evaluate the smooth curves 
(and standard errors) at a nice regular set of points for plotting. Also 
don't forget that the residuals shown on plot.gam are the `partial residuals' 
(i.e. the residuals + the smooth concerned). 

best,
Simon



On Sunday 22 November 2009 01:09, Joe Trubisz wrote:
> Hello all...
>
> I'm attempting to write my own GAM plot function, so I can overlay it
> on top of an already existing plot.
>
> Problem is that after I do the gam, e.g. m<-gam(...), I cannot match
> the graph that gam.plot outputs  when I attempt to plot the values
> from m$residuals, m$linear.predictors or m$fitted.values. Kind of at a
> loss what variables to use or if I need to do something else before I
> attempt to plot them.
>
> Can someone explain to me where I'm going wrong and what I need to do
> to correct this?
>
> Thanks,
> Joe
>
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-- 
> Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK
> +44 1225 386603  www.maths.bath.ac.uk/~sw283