Hello all. I'm having the Vbeta problem right now, during a flex factorial design estimation (open another thread for that).
Also if I see that a kind of ultimate response was given, i'd like to add some, maybe, useful information.
Before running the flex factorial, I tried to run a full factorial design (3x3x2). The estimated design matrix looked very strange: I should have seen 18 block, one for each songle condition (fact1-1 fact2-1 fact3-1, fact1-1 fact2-1 fact 3-2, and so on), but indeed i could see only the 9 central block, while the first five and the last four looked totally black. I could see there was something there (cause surfing the matrix with mouse pointer i could see that the X of that condition IS different, but very close, to 0). I don't really know if the two issue (Vbeta/no suprathreshold voxel and X of the condition close to 0) are related, but i thought this could be a useful information for people stucked in Vbeta error.
Best regards
Federico
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