On Sat, 21 Mar 2009 09:59:47 +0100, < Marina> < Lopez-Sola>
<[log in to unmask]> wrote:
> Instead of 1 and 0-values for each group of con images entered in the
> different columns, I have values that are different from 1 and 0. Specifically,
> in the first colum I have 1.09 instead of 1 for the first group of images, in
> the second column 1.05 and in the third column 1.25. I would appreciate
> any information on why these values are different from 1 after the model
I think it's because of the nonsphericity correction.
If you look at the value of the design matrix in the SPM.mat file, usually the
actual design matrix (the "X") isn't modified like that. But there's another
structure which is the design matrix after "whitening".
[reply repeated after not checking "reply to list" the first time]