[FieldTrip] mixed between/within subject Anova

[Michael Wibral]

Dear Olga,

you might find this reference helpful with respect to permutation tests and ANOVA-like questions:

PERMUTATION TESTS FOR MULTI-FACTORIAL ANALYSIS OF VARIANCE
MARTI J. ANDERSON and CAJO J. F. TER BRAAK
Journal of Statistical Computation and Simulation,
2003, Vol. 73(2), pp. 85–113

Michael
(let me know if you have trouble getting it)

-----Ursprüngliche Nachricht-----
Von: "Eric Maris" <e.maris at donders.ru.nl>
Gesendet: Aug 18, 2011 7:50:08 AM
An: "'Email discussion list for the FieldTrip project'" <fieldtrip at donders.ru.nl>
Betreff: Re: [FieldTrip] mixed between/within subject Anova

>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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