Dear list,

i'm checking the residuals plots of a gam model after a processus of model
selection. I found the "best" model, all my terms are significant, the
r-square and the deviance explained are good, but I have strange residuals
plots:

http://dl.dropbox.com/u/1169100/gam.check.png
http://dl.dropbox.com/u/1169100/residuals_vs_fitted.png

What does explains the "curve" on those plots??

I've also plotted each explanatory variables included in the model against
residuals and everything looks fine.

Kind regards,

Sam

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