Hi Shashwath,
We got this error when using non-sphericity correction too. We found that it was a problem when you deselected one of your input contrasts. If you select a contrast by mistake when setting up your model then you have to go back to the start and set up your model again I'm afraid or this error will keep reoccurring.
Good luck,
Shane
--
Dr. Shane McKie,
Research Associate,
NPU G703
School of Medicine,
Division of Psychiatry,
University of Manchester,
Stopford Building, Oxford Road,
Manchester, UK. M13 9PT
Tel:- 0161 2757426
Email: [log in to unmask]
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Shashwath Meda
Sent: 13 November 2006 16:55
To: [log in to unmask]
Subject: [SPM] non-sphericity error - SPM2
Dear SPMers - I am currently trying to model a 2nd level RFX using the One
way anova (within subjs) model in SPM2. I have 3 conditions (3 cons for each
from 1st level analysis) for each subj (22) and set up a design with the
foll options
global calculation - omit
global normalisation - none
global mean scaling - none
non-sphericity correction - "yes"
correlated over subjs
correlated measures - "yes"
on estimating the design I get the following error
Temporal non-sphericity (over voxels) : ...REML estimation
Warning: Divide by zero.
> In spm_spm at 773
In spm_getSPM at 197
In spm_results_ui at 260
??? Error using ==> plus
Matrix dimensions must agree.
Error in ==> spm_reml at 116
h = h + dh;
Error in ==> spm_spm at 810
[V,h] = spm_reml(Cy,xX.X,xVi.Vi);
Error in ==> spm_getSPM at 197
[SPM] = spm_spm(SPM);
Error in ==> spm_results_ui at 260
[SPM,xSPM] = spm_getSPM;
??? Error while evaluating uicontrol Callback.
I would appreciate any suggestions/design modifications on how to avoid this
error? Thanks a lot for your time.
--
with regards,
Shashwath meda
***********************************************
Senior Research Assistant,
Olin Neuropsychiatry Research Center
Hartford Hospital/IOL.
Hartford, Connecticut 06106.
Cell: (313) 505-6847
Off: (860) 545-7804
***********************************************
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