Hi Ed, the problem is that your covariates are highly correlated. Eg, column 1 is nearly identical to column 17. doug
On 01/24/2013 06:36 AM, Ed Gronenschild wrote: > Hi, > > Running mri_glmfit ( v5.0.0, Mac OSX10.6) I got he following > error message: > > ERROR: matrix is ill-conditioned or badly scaled, condno = 1e+08 > 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 lh.sib_con_cann_aangepast3.thickness.sm0.mgh --fsgd > ../../STATS/FSGD/age_gender_scan_educ_hand_cannabis/fsgd_sib_con_cann_aangepast3.fsgd > > dods --glmdir lh.sib_con_cann_aangepast3.dods.sm0.glmdir --surf > fsaverage lh --C > ../../STATS/FSGD/age_gender_scan_educ_hand_cannabis/group_thickness_gender_scan_age_educ_hand_cann.mtx > > > 2. The FSGD file (if using one) > 3. And the design matrix above > > Please find attached the requested files. > > I noticed that rows 68 and 147 of the matrix Xg.dat are identical, > and most probably caused the error. > In the fsgd file I see that the correspondig cases indeed have > identical values, although they are referring to different data. > How to proceed? > > Cheers, > Ed > > = > > > > > > > > > _______________________________________________ > 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 FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
