In the 2nd option, age and weight (and other variables) are simultaneously fit to the data. Most people refer to this as "regressing out" the effect of one variable when looking at the other. But it is not regressing out age and then looking at the correlation of age with the residual. doug
On 03/27/2013 07:02 AM, Martijn Steenwijk wrote: > Dear all, > > I've a question regarding computing correlations with cortical > thicknesses on the surface; Suppose I have two variables for each > subject: (age and weight) and I want to compute the correlation > between cortical thickness and weight, corrected for age. > > Option 1: > Fsgd contains: Variables weight > Contrast file contains: 0 1 > > Option 2: > Fsgd contains: Variables age weight > Contrast file contains: 0 0 1 > > Is it true that the effect of age is regressed out in the second > option; and it computes the correlation between CT and weight after > correcting for age? > > Best, > Martijn > > > > _______________________________________________ > 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.
