what are you trying to test an interaction between? Can you send the first lines of your fsgd file?
On 05/07/2015 10:41 AM, Sarah Banducci wrote: > Hi all- > I have been trying to determine the most appropriate way to set up an > interaction contrast for glmfit. For my purposes I'm interested in > looking at the interaction two performance variables while covarying > demographics. I have 2 classes set to male and female and the first > columns in my fsgd file are demeaned age and education. > > I have found 3 ways people suggest setting up an interaction contrast: > 1- Putting the contrast in one row: > 0 0 0 0 -.5 -.5 .5 .5 > > 2- Using two rows for the contrast: > 0 0 0 0 .5 .5 0 0 > 0 0 0 0 0 0 .5 .5 > > 3- Creating an actual interaction term where the values are multiplied > together in a new column of the fsgd file > 0 0 0 0 0 0 0 0 .5 .5 > > I would be grateful to know how people set up this contrast. Also I > would like to know how you run it (positive or negative) and > subsequently how you interpret the results. > > > Thanks, > Sarah Banducci > > > _______________________________________________ > 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.
