[FieldTrip] Cluster-based permutation tests for between-subject design

Maris, E.G.G. (Eric) e.maris at donders.ru.nl
Thu Jan 8 12:26:52 CET 2015

```Yes, and this should also be exactly the recipe on the FAQ page.

Best,
Eric

From: Yoni Levy [mailto:yoniilevy at gmail.com]
Sent: dinsdag 6 januari 2015 13:11
To: fieldtrip at science.ru.nl
Subject: Re: [FieldTrip] Cluster-based permutation tests for between-subject design

More specifically, I was wondering about the recipe for a 2x2 mixed between-within-subjects design (with 2 groups of unequal size).
For instance, provided I have two groups: the first with subj1 till subj12 (12 participants), and the second with subj21 till subj34 (14 participants), and each participant with 2 conditions.
Then for each participant i calculate the difference between the 2 conditions (subjXdiff) (say for instance, the difference in power in each grid point), and then compare the two groups with an indepsamplesT: subj1diff, ... subj12diff    versus subj21diff,.. subj34diff.

Would such an indepsamplesT test correspond to testing the interaction between group and condition?

Thanks,
Yoni

On Tue, Jan 6, 2015 at 9:13 AM, Yoni Levy <yoniilevy at gmail.com<mailto:yoniilevy at gmail.com>> wrote:
Dear Eric,

Following up on the thread from about 2 months ago, in your reply (in FAQs: http://fieldtrip.fcdonders.nl/faq/how_can_i_test_an_interaction_effect_using_cluster-based_permutation_tests), when you mention the mixed between-within-subjects design, I assume that you refer to a design with two subjects groups which are of equal size (e.g. 12 participants vs 12 participants, and not 14 participants vs 12 participants). I assume that in the latter case (unequal groups' size), testing the interaction effect would not be possible; correct?

Thanks,
Yoni

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