Dear Chih-Hao,

This is to be expected for a model that includes subject effects. The
corresponding estimable contrast is [1 0 0 0 0 0 1/3 1/3 1/3 0 0 0] but
you are essentially trying to do a one-sample t-test with three subjects
so you should acquire data from more subjects before running a second
level model.

Best regards,
Guillaume.


On 11/01/17 06:55, 連 志浩 wrote:
> Dear experts,
>
>
> I have a problem when I tried to use flexible factorial design.
>
>
> All the bars below the design matrix are gray, and I can't do any contrast.
>
>
> GUI showed "no contrast(s)" when I open SPM contrast manager, and showed
> "!invalid contrast" when I try to input any contrast.
>
>
> It's a 2 x 4 flexible factorial design with a Group factor with 2 level
> and a Condition factor with 4 level, and I set 3 factors in my model:
>
>
> Factor 1: Subject, Independence: Yes, Variance: Equal
>
> Factor 2: Group, Independence: Yes, Variance: Unequal
>
> Factor 3: Condition, Independence: No, Variance: Equal
>
>
> I would appreciate for any help.
>
>
> Thanks for your reading.
>
>
> Best,
>
> Chih-Hao
>
>
>
>
>
>
>

--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG