Hi Francisco, thanks for chiming in. I guess you mean that if effects of the additional variables are not additive (and most often they would not be), then they indeed would be of little help for the linear classifier.
On the other hand, if additional variables themselves covary with the targets of interest, they would impact ALL the voxels, thus adding a global bias to the results across the voxels. On Mon, 14 Mar 2011, Francisco Pereira wrote: > voxels (judging by our experience). A different consideration is > whether the classifier can use the value of the extra variable to > change the way it uses the others; at first thought I'm not sure a > linear classifier will do there (but could well be wrong). -- =------------------------------------------------------------------= Keep in touch www.onerussian.com Yaroslav Halchenko www.ohloh.net/accounts/yarikoptic _______________________________________________ Pkg-ExpPsy-PyMVPA mailing list Pkg-ExpPsy-PyMVPA@lists.alioth.debian.org http://lists.alioth.debian.org/mailman/listinfo/pkg-exppsy-pymvpa
