I'm not too familiar with using grasp, but the error is generated from the `mgcv' package while setting up a GAM. The default smooths used for `s' terms by mgcv::gam are thin plate regression splines based on an `eigen approximation' to full thin plate splines. These have some nice properties but become expensive to set up for data sets with more than a few thousand points, in which case it is better to use a different basis for smooths of one variable, e.g. s(x,bs="cr") or for smooths of several variables use either tensor product smooths, e.g. te(x,z) or use the `knots' argument to `gam' in the way shown at the end of the examples in the `gam' help file.
Simon On Tuesday 15 August 2006 19:29, Ken Nussear wrote: > I tried this over a the grasp users yahoo group and got no > response....So I wonder if anyone here knows about grasper > > I keep getting this error when trying to run a model. > > > Error in smooth.construct.tp.smooth.spec(object, data, knots) : > Too many knots for t.p.r.s term: see `gam.control' to increase limit, > or use a > different > basis, or see large data set help for `gam'. > > > I'm using R for OSX Gui Version 1.16 R-version 2.3.1, running grasper > version > 0.4-4 > > > My dataset has ~7500 rows of input, and 21 cols of input. > > Does anyone have an idea how to troubleshoot this? > > Thanks > > > Ken > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch 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. -- > Simon Wood, Mathematical Sciences, University of Bath, Bath, BA2 7AY UK > +44 1225 386603 www.maths.bath.ac.uk/~sw283 ______________________________________________ R-help@stat.math.ethz.ch 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.