[pymvpa] Permutation test for each entry of contribution matrix?

Yaroslav Halchenko debian at onerussian.com
Tue Dec 6 16:10:15 UTC 2011


Good thinking Meng Liang -- that is what we also encourage people to do
to look at the actual confusion matrix where possible... to help you
best, please let us know which version of PyMVPA you are using?

On Tue, 06 Dec 2011, Meng Liang wrote:

>    Dear all,
>    I am trying to run a permutation test for a four-way classification and
>    I'm interested in the classification accuracy of each class rather than
>    the overall accuracy averaged across classes. I tried MCNullDist but it
>    only gives me the null distribution of the overall accuracy. Is there a
>    way to get the null distribution of the accuracy of each class? The best
>    thing would be to get the null distribution of each entry of the confusion
>    matrix so that I can calculate null distribution for any measure based on
>    the confusion matrix. 
>    Any suggestions?
>    Best,
>    Meng

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