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

[Yoni Levy]

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> 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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