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Dear Michael,<div><br></div><div>Thanks very much for your reply! I am using NeuroDebian virtual machine for running PyMVPA. It is built-in software and I don't even know which version of PyMVPA I'm using! How can I find out (sorry for the naive question, I'm just getting to know the NeuroDebian system)?</div><div><br></div><div>I'm looking forward to the new full example!</div><div><br></div><div>Thanks,</div><div>Meng</div><div><br><br>> Date: Fri, 11 Mar 2011 07:43:50 -0500<br>> From: michael.hanke@gmail.com<br>> To: pkg-exppsy-pymvpa@lists.alioth.debian.org<br>> Subject: Re: [pymvpa] Cross validation and permutation test<br>> <br>> On Tue, Mar 08, 2011 at 06:49:59PM +0000, Meng Liang wrote:<br>> > I was wondering if there is an easy implementation for performing<br>> > permutation test for a cross validation classification? I saw in the<br>> > permutation examples provided in the manual permutation can be built<br>> > in 'TransferError' and the p value can be obtained by '.null_prob'. Is<br>> > there a similar implementation for CrossValidatedTransferError? Also,<br>> > regarding the permutation example in the manual, I ran this example<br>> > several times and each time I got different p value - sometime very<br>> > significant sometime non-significant. The difference across runs still<br>> > exists even when I increase the permutation to 5000. Any explanation?<br>> <br>> Just a quick note (and sorry for the dealy). I'll see whether we can<br>> finally come up with a proper example for PyMVPA 0.6. The changes from<br>> 0.5 to 0.6 were partly motivated by the limitations that you are<br>> pointing out. In 0.6 it should be smoother -- we just need to document<br>> it. We'll see whether we can post a full example over the weekend.<br>> <br>> Hope that helps,<br>> <br>> Michael<br>> <br>> -- <br>> Michael Hanke<br>> http://mih.voxindeserto.de<br>> <br>> _______________________________________________<br>> Pkg-ExpPsy-PyMVPA mailing list<br>> Pkg-ExpPsy-PyMVPA@lists.alioth.debian.org<br>> http://lists.alioth.debian.org/mailman/listinfo/pkg-exppsy-pymvpa<br></div> </body>
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