For 3 conditions, you should use Generalized PPI.
http://www.nitrc.org/projects/gppi
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Wed, Jan 9, 2013 at 3:38 AM, Omar Mothersill <[log in to unmask]> wrote:
> Dear SPM users,
>
> I wish to perform a PPI analysis on a task that contains three conditions -
> is it valid to include all three condtitions in the PPI analysis? I wish to
> use a contrast comparing two conditions to one condition, i.e. under input
> variable and contrast weights I would enter:
>
> [1 1 1;
> 2 1 -2;
> 3 1 1]
>
> Any advice would be greatly appreciated.
>
> Kind regards,
>
> Omar
> --
> Omar Mothersill
>
> PhD Student
> Room 0.18, Neuropsychiatric Genetics Group, Dept. of Psychiatry
> Trinity Centre for Health Sciences
> St. James's Hospital
> Dublin 8.
>
> Phone: 01 896 2464
> Email: [log in to unmask]
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