[Eeglablist] Questions about Permutation and Paired t test

[Makoto Miyakoshi]

Dear Zaeem,

>  First Q: Does the same process happens when we call std_erspplot??

No. ICs should never be averaged before throwing them into the stats
function--otherwise how do you calculate variance? Hence the input must be
3-D (freq, time, ICs).

> Second Q: Why do we mean the data of each condition first and then make
statistical comparisons? Shouldn't the subject/components be permuted
across conditions?

You are right.

> Third Q: I have read the tutorial and article on cluster based
permutation testing in Fieldtrip. Is EEGLAB's permutation testing similar
to that?

I have never used the cluster-based test you mentioned. EEGLAB itself does
not support cluster-based test. It is only available as Fieldtrip's option.

Makoto


On Sat, Jul 18, 2020 at 2:49 PM Zaeem Hadi <zaeemhadi at ymail.com> wrote:

> Hello,
> I have some conceptual queries. I have seen many recommendations to use
> the following method when trying to compare data statistically.
> meanERSPcond1 = mean(erspdata{1,1},3);meanERSPcond2 =
> mean(erspdata{2,1},3);statcond({ meanERSPcond1 meanERSPcond2 }', 'method',
> 'permutation', 'paired','on','naccu',1000);
> Where '3' is the dimension of averaging, which in my case is components in
> a single cluster.
> First Q: Does the same process happens when we call std_erspplot??
> Second Q: Why do we mean the data of each condition first and then make
> statistical comparisons? Shouldn't the subject/components be permuted
> across conditions?
>
> Third Q: I have read the tutorial and article on cluster based permutation
> testing in Fieldtrip. Is EEGLAB's permutation testing similar to that?
>
> I'd be grateful for the help or any reference material in this regard.
> Kind Regards,
> Zaeem Hadi
> Brain and Vestibular GroupImperial College London
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