Can you send your fsgd file and your command-line? doug
lordowen wrote: > Dear Professor Greve: > > Thanks for your advisement. After re-value the covariates, the same > error report still popup. The value of age goes between 6.5-10.5 > (origin SD =2.9), and mean_thickness goes around 31-35 (origin SD = > 0.07). Can you give us some suggestions? > > Any other comments also welcome and appreciate.. > > 在 2010年2月24日上午12:00，Douglas N Greve <gr...@nmr.mgh.harvard.edu> 寫道： > >> you can divide the continuous variables by the standard deviation. >> >> doug >> >> lordowen wrote: >> >>> Dear freesurfer experts: >>> >>> We are using freesurfer to preform a cortical thickness analysis >>> between patients and controls. We plan to use the mean_thickness and >>> subject age as covariates. It's fine to analysis as group x age or >>> group x mean_thickness, respectively. But when we set design as group >>> x age x mean_thickness, an error report appeared in the terminal: >>> -------- >>> Matrix condition is 11355.6 >>> ERROR: matrix is ill-conditioned or bad scaled, condno = 11355.6 >>> Possible problem with experimental design: >>> Check for duplicate entries and /or lack of range of continuous >>> variables within a class. >>> (continuous with values in Xg.dat) >>> ------ >>> >>> Does the problem course by the different "range" from age value >>> (between 18-28) and mean_thickness (between 2-4) with in the same >>> subject? if so, how can we solve it? Does proportional scaling on age >>> or mean_thickness help? >>> >>> Any comments are welcome and very appreciate. >>> >>> >>> >> -- >> 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 >> >> >> > > > > -- 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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
