Hi,
I'm trying to analyze a dataset in SPM and getting a "beta not
uniquely specified error" for certain runs when I look at my design
matrix. I've ensured that all of my event onset times are unique, and
that all event durations are 0.
Interestingly enough, I do not get this error if I process individual
runs. For example: if I process runs 1 and 2 (as separate sessions) of
subject 22's data, run 2's data is not uniquely specified. However, if
I process run 2 individually, this error does not occur.
Can anyone please clarify what the error means, and what might be
causing my error?
Many thanks for your help!
Deborah Tang, Doctoral Candidate
McGill University
Montreal Neurological Institute
3801 University St, Room WB 214D
Montreal, QC H3A 2B4
Canada
Phone: (514) 398-6644 Ext. 089469
Fax: (514) 398-8948
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