Hi Marris,
I saw your settings and noticed that Implicit Mask is set to 'No'.
I think this should be set to 'Yes.'
If you still see errors, something must be wrong in one or more files
in your dataset.
I will go through each one of them.
Guillaume and Donald gave a good advice on checking data a few days ago.
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=spm;501709e8.1504
<quote>
>> load SPM.mat
>> spm_check_registration(SPM.xY.P)
and scroll through your entire dataset. Plotting the globals can also
give you a hint about suspicious scans:
>> figure, plot(SPM.xGX.rg)
</quote>
note that spm_check_registration can load up to 24 files.
Since your dataset is quite large, I think
>> load SPM.mat
>> figure, plot(SPM.xGX.rg)
will give you some hint.
If you prefer GUI, I recommend using "Check sample homogeneity using
covariance" function implemented in VBM8 toolbox. It's easy to use and
quite useful to detect the poor quality data.
Another concern: I see you set centering on Gender. Basically you
don't want to center dummy variables such as gender. It's also
described in VBM tutorial. I would set "No centering" on gender. (and
probably group if the order of group doesn't mean anything.)
Best regards,
Kiyotaka
2015-05-05 13:30 GMT+09:00 Marris Atwood <[log in to unmask]>:
> Hi Kiyotaka and Indrajeet,
>
> Sincere thanks to both of you! Now I understand what I edit should be a setting file instead of SPM.mat.
>
> Your pointers on global normalization are very enlightening. Yet, the strange thing is, I am not using "proportional" for global normalization. Instead, I am treating it as a covariate by using "ANCOVA".
>
> I have attached my saved settings here. Any guess is very much welcomed and appreciated!
>
> Thanks a lot,
> MA
>
>
--
Kiyotaka Nemoto, M.D., Ph.D.
Assistant Professor
Department of Psychiatry
Division of Clinical Medicine, Faculty of Medicine
University of Tsukuba
1-1-1Tennodai Tsukuba, Ibaraki 305-8575, Japan
E-mail: [log in to unmask]