"e.g. some super-ordinate category (e.g. animate-vs-inanimate) you would like to cross-validate not across functional runs BUT across sub-ordinate stimuli categories (e.g. train on humans/reptiles/shoes/scissors to discriminate animacy and cross-validate into bugs/houses, then continue with another pair to take out)."
BTW, this exactly what I would like to do but I still don't figure out how to leave out the test trials from the training trials, so they don't get classified into themselves. On Wed, Oct 24, 2012 at 5:15 PM, Jacob Itzhacki <[email protected]> wrote: > Please do! > > and thank you for all the responses :D > > Don't want to come across as lazy but I'm not a master coder at all so > sometimes figuring out what one line of code does can be quite the ordeal, > in my case. > > J > > On Wed, Oct 24, 2012 at 3:54 PM, Yaroslav Halchenko <[email protected] > > wrote: > >> >> On Wed, 24 Oct 2012, MS Al-Rawi wrote: >> > Cross-validation is fine even in this case, you'll just need to >> rearrange >> > your data in a way to leave-a-set-of-stimuli out, instead of >> > leave-one-run-out. Perhaps PyMVPA has some functionality to do this. >> >> now it is getting interesting -- I think you got close to what I thought >> the question was about: to investigate the conceptual/true effect of >> e.g. some super-ordinate category (e.g. animate-vs-inanimate) you >> would like to cross-validate not across functional runs BUT across >> sub-ordinate stimuli categories (e.g. train on >> humans/reptiles/shoes/scissors to discriminate animacy and >> cross-validate into bugs/houses, then continue with another pair to take >> out). And that is what I thought for a moment the question was >> about ;) >> >> This all can be (was) done with PyMVPA although would require 3-4 >> lines of code instead of 1 to accomplish ATM. If anyone interested I >> could provide an example ;)... ? >> >> -- >> Yaroslav O. Halchenko >> Postdoctoral Fellow, Department of Psychological and Brain Sciences >> Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755 >> Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419 >> WWW: http://www.linkedin.com/in/yarik >> >> _______________________________________________ >> Pkg-ExpPsy-PyMVPA mailing list >> [email protected] >> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa >> > >
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