Re: [Freesurfer] Continuous co-variate by continuous co-variate interaction effects
Hi Tim, sorry, just getting back to this. Can you repost with the rest of the email chain? On 8/24/17 12:21 PM, Timothy Hendrickson wrote: Hi Doug, Yes thank you this was my contrast matrix, not my design matrix. I've taken your advice by multiplying the co-variates together. Thanks for the help! -Tim ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer ___ 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.
Re: [Freesurfer] Continuous co-variate by continuous co-variate interaction effects
Hi Doug, Yes thank you this was my contrast matrix, not my design matrix. I've taken your advice by multiplying the co-variates together. Thanks for the help! -Tim ___ 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.
Re: [Freesurfer] Continuous co-variate by continuous co-variate interaction effects
Is that your design matrix or the contrast matrix? To test for the interaction between two continuous variables, one usually creates a new variable by multiplying them together and then just testing for the regressor for that variable being different than zero On 08/23/2017 12:34 PM, Timothy Hendrickson wrote: > Freesurfer experts, > > I have created a design matrix in order to test for whether there is > an interaction effect between two continuous co-variates controlling > for a categorical variable. > > So I have one categorical variable with two levels, and two continuous > co-variates. > > My design matrix is as follows: > > 0 0 1 1 0 0 > 0 0 0 0 1 1 > > Is this correct? > > -Tim > > Timothy Hendrickson > Department of Psychiatry > University of Minnesota > Bioinformatics and Computational Biology M.S. Candidate > Office: 612-624-6441 > Mobile: 507-259-3434 (texts okay) > > > ___ > 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: 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 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.
[Freesurfer] Continuous co-variate by continuous co-variate interaction effects
Freesurfer experts, I have created a design matrix in order to test for whether there is an interaction effect between two continuous co-variates controlling for a categorical variable. So I have one categorical variable with two levels, and two continuous co-variates. My design matrix is as follows: 0 0 1 1 0 0 0 0 0 0 1 1 Is this correct? -Tim Timothy Hendrickson Department of Psychiatry University of Minnesota Bioinformatics and Computational Biology M.S. Candidate Office: 612-624-6441 Mobile: 507-259-3434 (texts okay) ___ 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.
