regarding interaction calculation

[Nathan Weisz]

On 20.04.2010, at 13:19, Tzvetan Popov wrote:

> Dear Users,
>
> I have a question regarding calculation of interaction. One imagine 5 subjects observed in 3 experimental conditions. In this case to test the differences between those three conditions, one would use 'depsamplesF'  with the following design matrix:
>
> design = [1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
>                  1 1 1 1 1 2 2 2 2 3 3 3 3 3 3]; , where uvar=1 and ivar=2
>
> Now if one imagine 2 sessions of the same 5 subjects and want to calculate 2x3 ANOVA the design matrix may look like this;
>
> design = [1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5
>                  1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
>                  1 1 1 1 1 2 2 2 2 3 3 3 3 3 3 1 1 1 1 1 2 2 2 2 3 3 3 3 3 3];, where uvar=1, ivar=3 and the second row represents the group affiliation.
>
> If this calculation is possible, which I am also not certain, my question is, is the design matrix correct and what should be the cfg. setting for the 'group affiliation' row?
>
> Many many thanks
> tzvetan
>
>
>
> *******************************************
> Tzvetan Popov
> Clinical Psychology
> University of Konstanz
> Box 23
> 78457 Konstanz, GERMANY
> Phone: 0049-7531-883086
> Fax:      0049-7531-884601
> Email:  tzvetan.popov at uni-konstanz.de
> *******************************************
>
> ----------------------------------
> The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.

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The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.