I'm trying to see if two behavioral variables interact (they are factors 1 and 2) while controlling for the demographics also included in the fsgd file. I would also like to run an interaction with age and factor1.
Here are the first few lines of my fsgd file. Thanks GroupDescriptorFile 1 Title STX Class Male Class Female Variables Age_demeaned Edu_demeaned Factor1 Factor2 Input F01_1 Female -5.08888889 1.85555556 0.9 0.93 Input F02_1 Male 1.91111111 -0.14444444 0.85 0.85 On Fri, May 8, 2015 at 3:51 PM, Douglas N Greve <gr...@nmr.mgh.harvard.edu> wrote: > 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. > >
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