[pymvpa] Problems interpreting GroupClusterThresholding results

Bill Broderick billbrod at gmail.com
Mon Sep 28 12:59:20 UTC 2015


Hi,

Oh, I had skimmed over the page and had not noticed the algorithm was
expecting accuracy maps, so I was passing it error maps (thus lower is
better), hence my confusion.

I'm performing searchlight support vector regression, not classification,
so my error goes from 0 to 2 instead of 0 to 1. Can I simply take `2 -
error` (so higher is better) or does the algorithm require the values to
lie between 0 and 1? The docs say the accuracy maps must be the result of
classification, but is there a specific reason regression won't work?

Thanks,
Bill
On Sep 28, 2015 5:21 AM, "Richard Dinga" <dinga92 at gmail.com> wrote:

> Hi,
> I am pretty sure, that they are added to a cluster if they are higher than
> a threshold.
> You are looking for voxels with the accuracy significantly higher than a
> chance.
>
> Best,
> Richard
>
> _______________________________________________
> Pkg-ExpPsy-PyMVPA mailing list
> Pkg-ExpPsy-PyMVPA at lists.alioth.debian.org
> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-exppsy-pymvpa
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.alioth.debian.org/pipermail/pkg-exppsy-pymvpa/attachments/20150928/833d2df8/attachment.html>


More information about the Pkg-ExpPsy-PyMVPA mailing list