I can't see anywhere that you would enter covariates by subject in the
flexible factorial design.
I think what you want is to have 1 covariate and 3*36 values listed in
Each covariate needs 3*36 values. Thus you got errors.
Best Regards, Donald McLaren
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Office: (773) 406-2464
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On Wed, Jul 20, 2011 at 11:32 AM, Ben Becker <[log in to unmask]> wrote:
> Dear SPMers,
> Ive analyzed a flexible factorial design with the factors:
> - Subject (36 subjects)
> - Condition (3)
> - Group (2)
> Analysis and results look fine.
> Now I want to include a covariate (the subjects performance in condition 1, 2, 3). I tried to enter the vector as a 3*36 vector:
> Subject 1: performance condition 1 / performance condition 2 / performance condition 3
> Subject 2: performance condition 1 / performance condition 2 /
> However, evaluation failed. Because the spm-help mentions to enter the covariates by subject I created 36 covariates and entered the 3 values for each subject. However, I get the following error message:
> Failed 'Factorial design specification'
> Index exceeds matrix dimensions.
] (v4178), function "spm_design_within_subject" at line 81.
] (v4185), function "spm_run_factorial_design" at line 508.
> Where is my mistake?
> Thanks in advance & best regards,