I also consider that option, but when I try the very same thing with a different, region (not related to the task). I get accuracies of 50%. So that makes me think that it is affected by the task, but I don't know what to think of it.
Regards On Mon, Nov 26, 2018 at 1:34 PM Kaustubh Patil <kaustubh.pa...@gmail.com> wrote: > I suspect that there might be something wrong in the code/how the data is > handled. > > If you 30% accuracy then that would mean that you will get 70% if you use > a simple rule to predict the "other class" after your classifier. This is a > sign that something is not right in data handling/evaluation. > > Best > > On Mon, Nov 26, 2018 at 1:27 PM Raúl Hernández <r...@lafuentelab.org> > wrote: > >> No, it is balanced. It has the same number of observations for each class. >> >> On Mon, Nov 26, 2018 at 12:52 PM Kaustubh Patil <kaustubh.pa...@gmail.com> >> wrote: >> >>> Just for clarification. >>> >>> Is that data imbalanced, i.e. many more observations from one class? >>> >>> Best, >>> Kaustubh >>> >>> On Mon, Nov 26, 2018 at 12:50 PM Raúl Hernández <r...@lafuentelab.org> >>> wrote: >>> >>>> Dear PyMVPA community, >>>> >>>> I'm doing classification in ROI's, I'm performing a simple 2 way >>>> classification using LSVM, and a leave-one-run-out cross-validation on 4 >>>> acquisitions. On some ROI's, I get a good accuracy for the number of >>>> participants (60%), but in others I get consistently bad accuracy (30%). To >>>> test whether the performance is above chance, I use a one sample t test (I >>>> know that it is not the best test for this type of data, I just use it as >>>> quick overview). When I test the bad accuracies, those are also >>>> significant. >>>> >>>> What does it mean a consistently bad accuracy? >>>> >>>> Regards, >>>> >>>> Raul >>>> _______________________________________________ >>>> Pkg-ExpPsy-PyMVPA mailing list >>>> Pkg-ExpPsy-PyMVPA@alioth-lists.debian.net >>>> >>>> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa >>> >>> _______________________________________________ >>> Pkg-ExpPsy-PyMVPA mailing list >>> Pkg-ExpPsy-PyMVPA@alioth-lists.debian.net >>> >>> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa >> >> _______________________________________________ >> Pkg-ExpPsy-PyMVPA mailing list >> Pkg-ExpPsy-PyMVPA@alioth-lists.debian.net >> https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa > > _______________________________________________ > Pkg-ExpPsy-PyMVPA mailing list > Pkg-ExpPsy-PyMVPA@alioth-lists.debian.net > https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa
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