Tank you very much. A-Do you mean the partial correlation coeff (PCC) at each voxel averaged over region? Finally a linear regression is done between cortical thickness of a composite region and NPS. However the authors discuss every individual region as related to disease. So a table with partials correlations of individuals ROIs with NPS seems useful to support the discussion. B- I'd like to obtain the covariance matrix of the regression made between cortical thickness, group and covariates. How can I do it?I'm not sure what you mean. Would this be a different matrix for each vertex?I cite the referee: "The authors must provide the covariance matrix of the regression made between cortical thickness, group and covariates as supplementary information in order to increase the value of the results." I don't have Matlab for mri_glmfit_pcc matlab. Stefano
----Messaggio originale---- Da: [email protected] Data: 2-dic-2013 20.47 A: <[email protected]> Ogg: Re: [Freesurfer] Linear regression On 12/02/2013 02:22 PM, [email protected] wrote: > Hi list, > > I have some questions, please. > > I performed linear regression by qdec to find the regions where the > cortical thinning correlates with neuropsychological test (NPS), > taking in account 3 nuisance factors. > > A- I individuated some posterior regions and now I'd like to build a > table with partials correlations of individuals ROIs with NPS. How can > I obtain the values for each region? Do you mean the partial correlation coeff (PCC) at each voxel averaged over region? You can get PCC maps using the mri_glmfit_pcc matlab command. You can then do the averaging over region using mri_segstats. > > B- I'd like to obtain the covariance matrix of the regression made > between cortical thickness, group and covariates. How can I do it? I'm not sure what you mean. Would this be a different matrix for each vertex? > > C- Is there a specific reference for qdec? No, it is just a GLM so any GLM reference will do. > > Thank you very much, > > > Stefano > > > > > > _______________________________________________ > Freesurfer mailing list > [email protected] > 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 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list [email protected] 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.
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