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I would make the model simpler. I would compute the difference images for each subject, then do a two-sample t-test with group (where group is the order).

You could also add order as a group factor in a flexible factorial model.

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
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Tue, May 8, 2012 at 8:37 AM, Ciara Mccabe <[log in to unmask]> wrote:

Dear SPMers

 

I have ran a one-way ANOVA within subjects, with 20 subjects  

 

Entering 2 scans each subject            Scan 1 drug scan 2 placebo

 

I now want to add a covariate of ORDER

Is this just a string  40 numbers   with 1 for scan was week 1 and 2 for scan was week 2?

 

And can I do the same for gender?

Thanks

Ciara

 

Dr Ciara McCabe

Neuroscience Building

Dept of Psychiatry

Warneford Hospital

Oxford University

Oxford

OX3 7JX

 

Tel: 01865 223778

Mob: 07966035631

http://www.psychiatry.ox.ac.uk/research/researchunits/perl/perlmembers/ciaramccabe/