[pymvpa] ttest: significance level?

Pegah Kassraian Fard pegahkf at gmail.com
Fri Oct 27 19:48:33 UTC 2017


Many thanks!!

On Oct 27, 2017 8:22 PM, "Nick Oosterhof" <n.n.oosterhof at googlemail.com>
wrote:

>
>
> On 27 October 2017 at 13:19, Pegah Kassraian Fard <pegahkf at gmail.com>
> wrote:
>
>> I have a very basic question regarding the provided t-test (
>> http://www.pymvpa.org/generated/cmd_ttest.html) which I want to apply to
>> my searchlight results:
>> Why exactly is there no parameter for the alpha value?
>>
>
> Although I did not implement this function myself, my best guess is that
> it would have been more work to implement.
>
> However, the output can be set to represent p-values, so it should be
> trivial to identify (mask) voxels that pass (or do not pass) a specific
> alpha level.
>
>
>
>> I guess accordingly, that this t-test is not corrected for multiple
>> comparisons?
>>
>
> As far is I can see, indeed, it does not.
>
> For multiple comparisons, consider: http://www.pymvpa.org/
> generated/mvpa2.algorithms.group_clusterthr.GroupClusterThreshold.html
>
>
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