[pymvpa] Crossvalidation and permutation scheme on one run only

[Richard Dinga]

> Do you have to do within-subjects classification, or could you
cross-validate on the subjects? (I guess that is option 4.) That would also
simplify the permutation testing.

yes, I am interested in within subject pattern of activities, possibly RSA

> If you need to stick to cross-validation within people, I'd prefer
splitting the dataset into two halves (first half of the run, second half
of the run, which I assume is your option 1) over option 2: adding more
cross-validation folds just compounds the potential confounds, and there's
nothing special about 10 folds.

10 folds has almost twice as many training points, therefore I guess it
will have higher accuracy, and with split half, there still wouldn't be
much to permute
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