[pymvpa] permutation distribution

John Clithero john.clithero at gmail.com
Wed Mar 10 16:24:37 UTC 2010


Hi PyMVPA users,

A simple question:
If I am conducting permutation tests, such as

cv_terr = CrossValidatedTransferError(
                TransferError(clf),
                NFoldSplitter(),
                enable_states=['dist_samples'],
                null_dist=MCNullDist(permutations=num_perm,tail='left'))
print 'Corresponding p-value : ', cv_terr.null_prob

How do I call the set of values that are used to calculate the p-value? In
other words, I'd like to plot all values from the permutations (e.g.,
histogram).

"cv_terr.null_dist" does not seem to do the trick here.

Cheers,
John
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