[pymvpa] Unbalanced Datasets

Bill Broderick billbrod at gmail.com
Mon Apr 27 17:40:39 UTC 2015

Hi all,

Thanks Jo and Taku for the responses. I will try using either the
sub-sampling or over-sampling methods instead then. I thought that
weighting the classes would do functionally the same thing -- why isn't it
common practice?

Taku, or anyone else, do you have any references for the bootstrapping
method you mentioned? Neither I nor my collaborators have heard of that
method for fMRI, but it would be nice to be able to use most or all of our
data from the larger class.

Jo, we are changing the cross-validation partition to
leave-one-subject-out, but it still ends up pretty imbalanced. So we're
still going to have to use a method to correct the imbalance...

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