[FieldTrip] mixed between/within subject Anova

[Eric Maris]

Dear Olga,

> I'd like to use mixed between subjects (3 groups) and within subject (2
> factors each has 2 levels) Anova design to compare the ERPs using cluster
> permutation statistics (ft_timelockananlysis).
> But to my understanding it is impossible. Am I right?

The problem is with the interaction effects. With permutation tests, you
cannot test the interaction between two (or more) between-UO variables
(UO=subject or trial) nor the interaction between two or more within-UO
variables. However, with permutation tests, you can test the interaction
between a between- and a within-UO variables. So. In your study, you would
only be unable to test the interaction between the two within-subject
variables.

There have been more threads on the testing of interaction effects. You can
find them by searching in the discussion list archive.

Best,

Eric Maris




> 
> You comments are highly appreciated,
> 
> Best Regards,
> Olga.
> 
> 
> Olga Sysoeva,
> Research Associate, PhD
> Washington University School of Medicine
> Campus Box 8134
> 660 South Euclid Ave
> Saint Louis, MO 63110-9909
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