Dear SPM er`s
I wanted to define my contrasts, aber having estimated my flexible factorial design in the ANOVA and to test for two single regressors in the interaction group and condition: (interaction main effect [2 3]).
For example: the following contrast in the interaction: group1 condition 1 negativly and condition2 positivly against group 2 condition 1positivly and condition2 negativly contrasted against each other (-1 1 0 0 0 0 0 1 -1 0 0 0 0 0) as you can see in the appendage. But I don´t know how to set up the contrast weights for the subjects, groups and the conditions in the designed matrixas well as for the interaction.
Everything I tried, there popped up the advice: “Invalide error”
subjects: 27
group 1: 18
group 2: 9
conditions: 7
In the web, I found an example for contrast weights in flexible factorial designs with multiple groups of subjects - a test for two single regressors in the interaction group and condition, they here say:
ones (1, n1+n2)/ (n1*n2) n1/(n1+n2) n2/(n1+n2) 100 n1/(n1+n2) 00 n2/(n1+n2) 00.
I didn`t really understood this exactly, but I tried this without success -> always the error message popped up.
Do you have any idea how to enter the contrasts correctly.
Thank you very much for your efforts.
Best regards,
Christiane ArnoldUniversity of Frankfurt am Main
Clinic of Neurology
Brain Imaging Center - Cognitive Neuroscience
Schleusenweg 2-16
60528 Frankfurt am Main
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