Dear Doug,

Thank you, this is very helpful! I had searched the web and the fs site 
extensively but did not find anything helpful on this problem before you 
rescued me. 

I have some follow up questions:

1. Can the DeMeanFlag be used in qdec (qdec was segfaulting when doing similar 
analyses and presumably it is for the same reason)

2. When does correlations between covariates becomes a problem (e.g. 0.6 or 0.9)

3. When using dods, what are my options with somewhat correlated measures. I 
research brain changes in ageing. Typically I control for age, gender, icv, and 
sometimes other variables. In ageing, age, icv, and cognition tend to be 
correlated but it is critical to control, say, for icv to determine whether an 
effect of interest is due to women having on average smaller heads and 
therefore smaller brains or due to brain atrophy in some individuals, or to 
other factors.

I really appreciate yours and your team's efforts both in developing great 
software and answering questions from challenged users like myself.

Regards,

Nic


-----Original Message-----
From:   Doug Greve [mailto:[EMAIL PROTECTED]
Sent:   Wed 3/12/2008 5:34 AM
To:     Nicolas Cherbuin
Cc:     freesurfer@nmr.mgh.harvard.edu
Subject:        Re: [Freesurfer] mri_glmfit problem


The problem is that there is a strong correlation in the two continuous 
variables due to their large non-zero means. The knee-jerk reaction is 
to simply demean the variables which is sometimes the right thing to do 
and sometimes not. In this case, I think it is ok because you are using 
DOSS. If you were to switch to DODS, it would be the wrong thing to do. 
Note, you can instruct mri_glmfit to demean the continuous variables by 
adding the following line to your fsgd file:

DeMeanFlag 1

Again,  you should be careful with this and don't use it with DODS

doug


Nicolas Cherbuin wrote:

>Hi,
>
>I am analysing structural data with mri_glmfit. After pre-processing I have 
>first used one group variable (gender) with one covariate age. I had no 
>problem processing the data and visualising it in tksurfer.
>
>I then tried to add another covariate (measure of immediate recall). So I had 
>in total one group variable and two covariates. I reanalysed the data but got 
>the following error:
>
>FixVertexAreaFlag = 1
>UseMaskWithSmoothing     1
>OneSampleGroupMean 0
>y    
>/media/storage2/proc/freesurfer/60_w2/checked/analysis/lh.gender_age_immrec.thickness.10.mgh
>logyflag 0
>usedti  0
>FSGD gender_age_immrec_fsgd.txt
>glmdir lh.gender_age_immrec.glmdir
>DoFFx 0
>Creating output directory lh.gender_age_immrec.glmdir
>Loading y from 
>/media/storage2/proc/freesurfer/60_w2/checked/analysis/lh.gender_age_immrec.thickness.10.mgh
>Matrix condition is 12866.7
>ERROR: matrix is ill-conditioned or badly scaled, condno = 12866.7
>Possible problem with experimental design:
>Check for duplicate entries and/or lack of range of
>continuous variables within a class.
> 0.000   1.000   68.000   10.000;
> 1.000   0.000   65.000   5.000;
>[trunkated the fsgd file output but it is the same as the one used for the 
>sucessful analysis except for one extra column]
>
>After this error I thoroughly checked all my files but could not find anything 
>wrong. So to check I could do an analysis using the extra variable I did 
>another analysis with gender and immrec. This worked without problem.
>
>I have attached all my fsgd files and mat files. They all use the same 
>subjects and gender info and only differ by one column. Since permutations 
>worked I cannot fathom why it does not work when all put together.
>
>The mri_glmfit syntax used for each analysis was:
>
>mri_glmfit --y lh.gender_age_immrec.thickness.10.mgh   --fsgd 
>gender_age_immrec_fsgd.txt doss  --glmdir lh.gender_age_immrec.glmdir   --surf 
>average100 lh --C gender_age_immrec.mat
>
>mri_glmfit --y lh.gender_immrec.thickness.10.mgh   --fsgd 
>gender_immrec_fsgd.txt doss  --glmdir lh.gender_immrec.glmdir   --surf 
>average100 lh --C gender_immrec.mat
>
>mri_glmfit --y lh.gender_age_immrec.thickness.10.mgh   --fsgd 
>gender_age_immrec_fsgd.txt doss  --glmdir lh.gender_age_immrec.glmdir   --surf 
>average100 lh --C gender_age_immrec.mat
>
>I use 4.01 (but also checked with 4.02) under Ubuntu 64 bit on a Xeon machine.
>
>Thanks very much for your help
>
>Nic
>
>  
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>  
>
>------------------------------------------------------------------------
>
>GroupDescriptorFile 1                          
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>Class  Female  circle  red     
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>DefaultVariable        age                     
>  
>
>------------------------------------------------------------------------
>
>
>$Id: mri_glmfit.c,v 1.138.2.1 2007/09/12 15:38:19 nicks Exp $
>cwd /media/storage2/proc/freesurfer/60_w2/checked/analysis
>cmdline mri_glmfit --y lh.gender_age_immrec.thickness.10.mgh --fsgd 
>gender_age_immrec_fsgd.txt doss --glmdir lh.gender_age_immrec.glmdir --surf 
>average100 lh --C gender_age_immrec.mat 
>sysname  Linux
>hostname mri-lab
>machine  x86_64
>user     u3184049
>FixVertexAreaFlag = 1
>UseMaskWithSmoothing     1
>OneSampleGroupMean 0
>y    
>/media/storage2/proc/freesurfer/60_w2/checked/analysis/lh.gender_age_immrec.thickness.10.mgh
>logyflag 0
>usedti  0
>FSGD gender_age_immrec_fsgd.txt
>glmdir lh.gender_age_immrec.glmdir
>DoFFx 0
>  
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Freesurfer mailing list
>Freesurfer@nmr.mgh.harvard.edu
>https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
>

-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
[EMAIL PROTECTED]
Phone Number: 617-724-2358 
Fax: 617-726-7422

In order to help us help you, please follow the steps in:
surfer.nmr.mgh.harvard.edu/fswiki/BugReporting






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