Try normalizing the continuous covariates (ie, subtract the mean and 
divide by the stddev)

On 9/29/15 9:16 AM, Lim, Lena wrote:
> Thanks, Amanda. Yep,  I did that. It works alright if I removed IQ and used 
> only Age and Gender as covariates...
>
>
> -----Original Message-----
> From: freesurfer-boun...@nmr.mgh.harvard.edu 
> [mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of Worker, Amanda
> Sent: 29 September 2015 14:11
> To: 'Freesurfer support list'
> Subject: Re: [Freesurfer] qdec error
>
> Hi Lena,
>
> Have you changed your Group.levels file to include the two groups you are 
> currently looking at? If this doesn't match your qdec table it will not work.
>
> Best wishes,
>
> Amanda
>
> ________________________________________
> From: freesurfer-boun...@nmr.mgh.harvard.edu 
> <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Lim, Lena 
> <lena....@kcl.ac.uk>
> Sent: 29 September 2015 12:42
> To: 'Freesurfer support list'
> Subject: Re: [Freesurfer] qdec error
>
> Thanks, Doug. I used the qdec table attached.
>
> L
>
>
> -----Original Message-----
> From: freesurfer-boun...@nmr.mgh.harvard.edu 
> [mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of Douglas N Greve
> Sent: 28 September 2015 21:54
> To: freesurfer@nmr.mgh.harvard.edu
> Subject: Re: [Freesurfer] qdec error
>
> Can you send the FSGD file?
>
> On 09/28/2015 02:06 PM, Lim, Lena wrote:
>> Sorry, please see error below:
>>
>>
>>
>> Reading
>> /software/system/freesurfer/freesurfer-5.3.0/tktools/tkUtils.tcl
>>
>> Using
>> /software/system/freesurfer/freesurfer-5.3.0//lib/tcl/fsgdfPlot.tcl
>>
>> Loading data table 
>> /home/spjwker/PAC/Lena/CT_SA/FSL/PCHC3/qdec.table_PCHC.dat...Number of 
>> columns:  5
>> fsid column:        1
>> Number of factors:  4
>> Number of subjects: 46
>>
>> Data table /home/spjwker/PAC/Lena/CT_SA/FSL/PCHC3/qdec.table_PCHC.dat loaded.
>> Verifying subject data..............................................Subject 
>> verification complete.
>> Input table:
>> /home/spjwker/PAC/Lena/CT_SA/FSL/PCHC3/qdec.table_PCHC.dat
>> Subj#, SubjID, Data...
>>       1 PAC01 HC Male 110.000000 16.170000
>>       2 PAC02 HC Male 108.000000 16.170000
>>       3 PAC03 HC Male 118.000000 14.500000
>>       4 PAC04 HC Male 113.000000 17.250000
>>       5 PAC05 HC Male 125.000000 17.330000
>>       6 PAC06 HC Male 102.000000 15.420000
>>       7 PAC09 HC Female 115.000000 16.420000
>>       8 PAC12 HC Female 106.000000 16.500000
>>       9 PAC14 HC Male 106.000000 19.080000
>>      10 PAC18 HC Male 106.000000 19.080000
>>      11 PAC19 HC Male 91.000000 18.330000
>>      12 PAC23 HC Male 109.000000 16.670000
>>      13 PAC24 PC Female 94.000000 20.330000
>>      14 PAC26B PC Female 96.000000 14.500000
>>      15 PAC27 PC Male 88.000000 17.750000
>>      16 PAC28 PC Male 76.000000 17.080000
>>      17 PAC33 PC Female 95.000000 13.920000
>>      18 PAC37 PC Female 79.000000 17.420000
>>      19 PAC38 HC Male 96.000000 16.250000
>>      20 PAC39 PC Male 112.000000 19.500000
>>      21 PAC40 HC Male 119.000000 18.250000
>>      22 PAC41 PC Male 92.000000 18.420000
>>      23 PAC42 PC Female 78.000000 13.170000
>>      24 PAC43 PC Male 96.000000 19.250000
>>      25 PAC44 PC Male 78.000000 15.000000
>>      26 PAC45 PC Female 84.000000 17.920000
>>      27 PAC46 HC Female 94.000000 19.830000
>>      28 PAC47 HC Male 107.000000 15.170000
>>      29 PAC48 PC Female 117.000000 20.500000
>>      30 PAC51 HC Male 112.000000 20.170000
>>      31 PAC52 PC Female 105.000000 12.420000
>>      32 PAC53 HC Male 88.000000 18.830000
>>      33 PAC54 HC Male 82.000000 18.250000
>>      34 PAC56 HC Male 97.000000 17.920000
>>      35 PAC58 HC Male 109.000000 18.420000
>>      36 PAC59 PC Male 106.000000 17.750000
>>      37 PAC60B HC Male 104.000000 19.330000
>>      38 PAC61 HC Female 108.000000 18.330000
>>      39 PAC62 HC Male 93.000000 19.330000
>>      40 PAC63 PC Male 110.000000 12.420000
>>      41 PAC65 HC Female 100.000000 19.330000
>>      42 PAC66 PC Male 78.000000 18.920000
>>      43 PAC67 HC Male 114.000000 14.500000
>>      44 PAC68 HC Female 113.000000 16.670000
>>      45 PAC69 PC Female 89.000000 15.830000
>>      46 PAC70 PC Female 103.000000 17.920000
>> 1  Group  discrete 2
>>       1  HC
>>       2  PC
>> 2  Gender  discrete 2
>>       1  Male
>>       2  Female
>> 3  IQ  continuous 0
>> 4  Age  continuous 0
>>                   Continuous Factors:         Mean:       StdDev:
>>                   -------------------         -----       -------
>>                                    IQ       100.457        12.631
>>                                   Age        17.250         2.083
>>
>> Number of subjects:   46
>> Number of factors:    4 (2 discrete, 2 continuous)
>> Number of classes:    4
>> Number of regressors: 12
>> ============================================================
>> Data table loading completed successfully.
>> SUBJECTS_DIR is '/home/spjwker_PAC/Lena/CT_SA/FSL'
>> lh-Avg-Intercept-thickness ----------------------- Does the average
>> thickness differ from zero?
>> Nuisance factors: IQ Age
>>    1.000   1.000   1.000   1.000   0.000   0.000   0.000   0.000   0.000   
>> 0.000  0.000   0.000;
>>
>> lh-Diff-HC-PC-Intercept-thickness ----------------------- Does the
>> average thickness, accounting for Gender, differ between HC and PC?
>> Nuisance factors: IQ Age
>>    1.000  -1.000   1.000  -1.000   0.000   0.000   0.000   0.000   0.000   
>> 0.000  0.000   0.000;
>>
>> lh-Diff-Male-Female-Intercept-thickness ----------------------- Does
>> the average thickness, accounting for Group, differ between Male and Female?
>> Nuisance factors: IQ Age
>>    1.000   1.000  -1.000  -1.000   0.000   0.000   0.000   0.000   0.000   
>> 0.000  0.000   0.000;
>>
>> lh-X-Group-Gender-Intercept-thickness ----------------------- Is there
>> a Group--Gender interaction in the mean thickness?
>> Nuisance factors: IQ Age
>>    1.000  -1.000  -1.000   1.000   0.000   0.000   0.000   0.000   0.000   
>> 0.000  0.000   0.000;
>>
>> ninputs = 46
>> Checking inputs
>> nframestot = 46
>> Allocing output
>> Done allocing
>> nframes = 46
>> Writing to
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /y.mgh
>> gdfReadHeader: reading
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /qdec.fsgd
>> INFO: DeMeanFlag keyword not found, DeMeaning will NOT be done.
>> Continuous Variable Means (all subjects)
>> 0 IQ 100.457 12.493
>> 1 Age 17.2504 2.06066
>> Class Means of each Continuous Variable
>> 1 GroupHC-GenderMale 105.1905  17.4486
>> 2 GroupPC-GenderMale  92.8889  17.3433
>> 3 GroupHC-GenderFemale 106.0000  17.8467
>> 4 GroupPC-GenderFemale  94.0000  16.3930
>> INFO: gd2mtx_method is dods
>> Reading source surface
>> /home/spjwker_PAC/Lena/CT_SA/FSL/fsaverage/surf/lh.white
>> Number of vertices 163842
>> Number of faces    327680
>> Total area         65416.648438
>> AvgVtxArea       0.399267
>> AvgVtxDist       0.721953
>> StdVtxDist       0.195470
>>
>> $Id: mri_glmfit.c,v 1.196.2.8 2012/11/01 18:51:41 greve Exp $ cwd
>> /home/spjwker_PAC/Lena/CT_SA/FSL cmdline mri_glmfit --y
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /y.mgh --fsgd
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /qdec.fsgd dods --glmdir
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> --surf fsaverage lh --label
>> /home/spjwker_PAC/Lena/CT_SA/FSL/fsaverage/label/lh.aparc.label --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Avg-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Diff-HC-PC-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Diff-Male-Female-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-X-Group-Gender-Intercept-thickness.mat
>> sysname  Linux
>> hostname nanlnx2.iop.kcl.ac.uk
>> machine  x86_64
>> user     spjwker
>> FixVertexAreaFlag = 1
>> UseMaskWithSmoothing     1
>> OneSampleGroupMean 0
>> y    
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/y.mgh
>> logyflag 0
>> usedti  0
>> FSGD
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /qdec.fsgd labelmask
>> /home/spjwker_PAC/Lena/CT_SA/FSL/fsaverage/label/lh.aparc.label
>> maskinv 0
>> glmdir
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> IllCondOK 0
>> ReScaleX 1
>> DoFFx 0
>> Creating output directory
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> Loading y from
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /y.mgh
>> INFO: gd2mtx_method is dods
>> Saving design matrix to
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /Xg.dat Normalized matrix condition is 13598.1 Design matrix
>> ------------------
>>    1.000   0.000   0.000   0.000   110.000   0.000   0.000   0.000   16.170  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   108.000   0.000   0.000   0.000   16.170  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   118.000   0.000   0.000   0.000   14.500  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   113.000   0.000   0.000   0.000   17.250  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   125.000   0.000   0.000   0.000   17.330  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   102.000   0.000   0.000   0.000   15.420  
>>  0.000   0.000   0.000;
>>    0.000   0.000   1.000   0.000   0.000   0.000   115.000   0.000   0.000   
>> 0.000   16.420   0.000;
>>    0.000   0.000   1.000   0.000   0.000   0.000   106.000   0.000   0.000   
>> 0.000   16.500   0.000;
>>    1.000   0.000   0.000   0.000   106.000   0.000   0.000   0.000   19.080  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   106.000   0.000   0.000   0.000   19.080  
>>  0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   91.000   0.000   0.000   0.000   18.330   
>> 0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   109.000   0.000   0.000   0.000   16.670  
>>  0.000   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   94.000   0.000   
>> 0.000   0.000   20.330;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   96.000   0.000   
>> 0.000   0.000   14.500;
>>    0.000   1.000   0.000   0.000   0.000   88.000   0.000   0.000   0.000   
>> 17.750   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   76.000   0.000   0.000   0.000   
>> 17.080   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   95.000   0.000   
>> 0.000   0.000   13.920;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   79.000   0.000   
>> 0.000   0.000   17.420;
>>    1.000   0.000   0.000   0.000   96.000   0.000   0.000   0.000   16.250   
>> 0.000   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   112.000   0.000   0.000   0.000   
>> 19.500   0.000   0.000;
>>    1.000   0.000   0.000   0.000   119.000   0.000   0.000   0.000   18.250  
>>  0.000   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   92.000   0.000   0.000   0.000   
>> 18.420   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   78.000   0.000   
>> 0.000   0.000   13.170;
>>    0.000   1.000   0.000   0.000   0.000   96.000   0.000   0.000   0.000   
>> 19.250   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   78.000   0.000   0.000   0.000   
>> 15.000   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   84.000   0.000   
>> 0.000   0.000   17.920;
>>    0.000   0.000   1.000   0.000   0.000   0.000   94.000   0.000   0.000   
>> 0.000   19.830   0.000;
>>    1.000   0.000   0.000   0.000   107.000   0.000   0.000   0.000   15.170  
>>  0.000   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   117.000   0.000   
>> 0.000   0.000   20.500;
>>    1.000   0.000   0.000   0.000   112.000   0.000   0.000   0.000   20.170  
>>  0.000   0.000   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   105.000   0.000   
>> 0.000   0.000   12.420;
>>    1.000   0.000   0.000   0.000   88.000   0.000   0.000   0.000   18.830   
>> 0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   82.000   0.000   0.000   0.000   18.250   
>> 0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   97.000   0.000   0.000   0.000   17.920   
>> 0.000   0.000   0.000;
>>    1.000   0.000   0.000   0.000   109.000   0.000   0.000   0.000   18.420  
>>  0.000   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   106.000   0.000   0.000   0.000   
>> 17.750   0.000   0.000;
>>    1.000   0.000   0.000   0.000   104.000   0.000   0.000   0.000   19.330  
>>  0.000   0.000   0.000;
>>    0.000   0.000   1.000   0.000   0.000   0.000   108.000   0.000   0.000   
>> 0.000   18.330   0.000;
>>    1.000   0.000   0.000   0.000   93.000   0.000   0.000   0.000   19.330   
>> 0.000   0.000   0.000;
>>    0.000   1.000   0.000   0.000   0.000   110.000   0.000   0.000   0.000   
>> 12.420   0.000   0.000;
>>    0.000   0.000   1.000   0.000   0.000   0.000   100.000   0.000   0.000   
>> 0.000   19.330   0.000;
>>    0.000   1.000   0.000   0.000   0.000   78.000   0.000   0.000   0.000   
>> 18.920   0.000   0.000;
>>    1.000   0.000   0.000   0.000   114.000   0.000   0.000   0.000   14.500  
>>  0.000   0.000   0.000;
>>    0.000   0.000   1.000   0.000   0.000   0.000   113.000   0.000   0.000   
>> 0.000   16.670   0.000;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   89.000   0.000   
>> 0.000   0.000   15.830;
>>    0.000   0.000   0.000   1.000   0.000   0.000   0.000   103.000   0.000   
>> 0.000   0.000   17.920;
>> --------------------------------
>> ERROR: matrix is ill-conditioned or badly scaled, condno = 13598.1
>> --------------------------------
>> Possible problem with experimental design:
>> Check for duplicate entries and/or lack of range of continuous
>> variables within a class.
>> If you seek help with this problem, make sure to send:
>>     1. Your command line:
>>       mri_glmfit --y 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/y.mgh 
>> --fsgd 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/qdec.fsgd
>>  dods --glmdir 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender 
>> --surf fsaverage lh --label 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/fsaverage/label/lh.aparc.label --C 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/contrasts/lh-Avg-Intercept-thickness.mat
>>  --C 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/contrasts/lh-Diff-HC-PC-Intercept-thickness.mat
>>  --C 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/contrasts/lh-Diff-Male-Female-Intercept-thickness.mat
>>  --C 
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender/contrasts/lh-X-Group-Gender-Intercept-thickness.mat
>>     2. The FSGD file (if using one)
>>     3. And the design matrix above
>> Error in Analyze: command failed: mri_glmfit --y
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /y.mgh --fsgd
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /qdec.fsgd dods --glmdir
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> --surf fsaverage lh --label
>> /home/spjwker_PAC/Lena/CT_SA/FSL/fsaverage/label/lh.aparc.label --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Avg-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Diff-HC-PC-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-Diff-Male-Female-Intercept-thickness.mat --C
>> /home/spjwker_PAC/Lena/CT_SA/FSL/qdec/lh-thickness-PCHC-covIQAgeGender
>> /contrasts/lh-X-Group-Gender-Intercept-thickness.mat
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: freesurfer-boun...@nmr.mgh.harvard.edu
>> [mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of Douglas N
>> Greve
>> Sent: 28 September 2015 18:26
>> To: freesurfer@nmr.mgh.harvard.edu
>> Subject: Re: [Freesurfer] qdec error
>>
>> He Lena, can you repost with the error message as part of the email instead 
>> of as a word doc file.
>> doug
>>
>>
>>
>> On 09/28/2015 12:45 PM, Lim, Lena wrote:
>>> Sorry, I am re-posting below again for help...
>>>
>>> Dear Experts,
>>>
>>> I tried to see if the average area/thickness differ between the 2
>>> groups (HC and A) with IQ, Age and Gender as covariates using Qdec,
>>> but encountered the error (pls see attached). I tried the same thing
>>> for comparison between A and PC and it works fine... please kindly help?
>>>
>>> Many thanks,
>>>
>>> Lena
>>>
>>>
>>>
>>> _______________________________________________
>>> 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
> gr...@nmr.mgh.harvard.edu
> Phone Number: 617-724-2358
> Fax: 617-726-7422
>
> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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> www.nmr.mgh.harvard.edu/facility/filedrop/index.html
> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
>
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>
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