Hi all,
I'm trying to track down the cause of an "Invalid Contrast" error
message in my 1st-level analyses and I've hit a wall. I have a script
that generates contrast vectors for subjects based on certain
parameters, and the script worked for 5 subjects and on the 6th it
didn't. Half way through the 6th subject I get an Invalid Contrast
error message.
I've checked the contrast vector that failed, and it sums to zero and it
does not include any conditions with beta that cannot be estimated
(i.e., all the conditions set to be contrasted are estimable according
to the design matrix). Beyond these two things, I'm not sure what else
would cause an "Invalid Contrast" error message and I haven't been able
to find any information online. Has anyone got any ideas?
Thanks!
Cheers,
Jason
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