[pymvpa] Combine the fMRI data with other data in the pattern analysis?

[Yaroslav Halchenko]

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