Hi Daniel,
I would try to reduce the maxmem value to something like 'maxMem =
2^25' to read in a plane or two at a time, instead of a plank at a time.
It will take longer, but your machine should be able to handle it.
Regards,
Kent
______________________________
Kent A. Kiehl, Ph.D.
2255 Wesbrook Mall
Departments of Psychology and Psychiatry
University of British Columbia
Vancouver, B.C., Canada, V6T 2A1
http://www.psychiatry.ubc.ca/sz/nilab/personnel/kiehl/
Office 604-822-0777; Lab 604-822-7128; Fax: 604-822-7756
----- Original Message -----
From: Daniel Weissman <[log in to unmask]>
To: Kent Kiehl <[log in to unmask]>
Cc: <[log in to unmask]>
Sent: Thursday, March 23, 2000 8:24 AM
Subject: Re: Model Specification and Estimation
> Hi SPMers,
> I've been trying to estimate a model with 10 subjects, each of
> which has 8 runs of 176 TRs each. However, I ran out of memory when model
> estimation was 29% complete. So, it looks like I can't model estimate
> all 10 subjects together. I know that I can model estimate a smaller
> groups of subjects. Then, I could generate a contrast image for each
> subject. And, then, I could do basic stats on a series of contrast images
> to do a random effects model. I have 2 questions, though.
>
> 1) If one of my contrasts is an interaction (and I have an interaction
> contrast image for each of my 10 subjects), how do I analyze that at the
> second level?
>
> 2) Is there any way to do a fixed effects model with all 10
> subjects, even though I can't estimate the model with all 10 subjects
> together?
>
> Thanks,
> :> Daniel
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