[R] Avoiding overfitting in gam(mgcv)

2007-10-03 Thread kanno
nots selection will then be an important issue. Is there any other means to avoid overfitting when alalyzing small datasets? Thank you for your help in advance, Ariyo Kanno __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-he

Re: [R] How to avoid overfitting in gam(mgcv)

2007-10-03 Thread Ariyo Kanno
at very low values > > (3 to 5). However, I don't think this is reasonable because knots > > selection will then be an > > important issue. > > > > Is there any other means to avoid overfitting when alalyzing small > &

Re: [R] How to avoid overfitting in gam(mgcv)

2007-10-03 Thread Ariyo Kanno
mean square error of prediction of the validation data, which > was randomly selected and not used for regression. > > Best Wishes, > Ariyo > > 2007/10/3, Simon Wood <[EMAIL PROTECTED]>: > > On Wednesday 03 October 2007 10:49, Ariyo Kanno wrote: > > > I apprec

Re: [R] How to avoid overfitting in gam(mgcv)

2007-10-03 Thread Ariyo Kanno
e mean square error of prediction of the validation data, which was randomly selected and not used for regression. Best Wishes, Ariyo 2007/10/3, Simon Wood <[EMAIL PROTECTED]>: > On Wednesday 03 October 2007 10:49, Ariyo Kanno wrote: > > I appreciate your quick reply. > > I am using the

Re: [R] How to avoid overfitting in gam(mgcv)

2007-10-03 Thread Ariyo Kanno
Thank you for your advices. I will try even increased "gamma" values, and all-out cross-validations. 2007/10/3, Frank E Harrell Jr <[EMAIL PROTECTED]>: > Ariyo Kanno wrote: > > Sorry, let me fix 1 sentence. > > > > "Here I try to mean by "overfitti

[R] Convergence problem in gam(mgcv)

2007-10-04 Thread Ariyo Kanno
Dear all, I'm trying to fit a pure additive model of the following formula : fit <- gam(y~x1+te(x2, x3, bs="cr")) ,with the smoothing parameter estimation method "magic"(default). Regarding this, I have two questions : Question 1 : In some cases the value of "mgcv.conv$fully.converged" becomes "

Re: [R] Convergence problem in gam(mgcv)

2007-10-05 Thread Ariyo Kanno
y, Ariyo 2007/10/5, Simon Wood <[EMAIL PROTECTED]>: > Actually the answers to you questions may well be linked > > On Thursday 04 October 2007 22:11, Ariyo Kanno wrote: > > Dear all, > > > > I'm trying to fit a pure additive model of the following formula