Hello,
I am working with the spm5 and would like to study the interaction
effect on an ANOVA design with two within-subject factors (full
factorial design of basic models).
When studying this effect, it seems that there are two different
possibilities for the contrasts: [-1 1 1-1] and [1 -1 -1 1]. I'm not
sure how to interpret the direction of these contrasts and would like
to know whether they are determining the subsequent post hoc contrasts.
I hope that some of you can help me with this.
Thank you very much in advance, Diego Pinal
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