Dear Channelle,
I couldn't see an image of your design matrix but my guess is that you
didn't use the options Variance: Equal, Independence: Yes for what seems
to be a paired t-test.
Best regards,
Guillaume.
On 15/11/2019 20:29, Channelle Tham wrote:
> Dear SPM experts,
>
> I am looking for some advice on building a contrast design matrix of a longitudinal VBM for statistical analysis. I have 1 group of patients(n=19) with 2 time points MRIs.
> I am running into an error where the SPM.mat file when displayed in the contrast manager appears distorted and has error defining contrasts. I have displayed an image of it in the attachments above.
> In the design matrix displayed after the model estimation step, it shows no errors and looks similar to the one shown in the CAT12 manual.
>
> Thank you very much in advance,
> Channelle Tham
>
--
Guillaume Flandin, PhD
Wellcome Centre for Human Neuroimaging
UCL Queen Square Institute of Neurology
London WC1N 3BG
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