Hi Bo, I'm definitely not an expert of this, but I see that you really nead some help, so I tried to look at your matrix. From my humble opinion it doesn't look correct. Firstly, the first 9 groups are male groups and the last 9 are female groups. Then why are all female groups assigned 0 in the matrix? Secondly, since the interaction you are interested in have a df of 4, do you think maybe you should have 4 rows rather than 8 in your matrix?
Cherry On Sat, Nov 17, 2012 at 9:21 PM, xiangbo_2010 <xiangbo_2...@126.com> wrote: > Hi Freesurfer experts,**** > > I'm very sorry to bother you, but I am very confused with the following > questions: > > My experimental design includes three discrete factors: factor > 1 with three levels (A,B,C ); factor 2 with three levels (O,P,Q); gender > (F, M), and one covariate. > > So I can get 18 classes: FAO, FAP,FAQ,FBO,FBP,FBQ,FCO,FCP,FCQ,MAO, > MAP,MAQ,MBO,MBP,MBQ,MCO,MCP,MCQ. I want to perform the interaction > between factor 1 and factor 2 regressing out the effect of gender and one > covariate, but I don't know the rules for setting the contrasts for the > F-test. The contrast matrix I used is: > > 1 1 1 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > 1 -1 0 1 -1 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > 1 1 1 0 0 0 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > > 1 0 -1 1 0 -1 1 0 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 > > 0 0 0 0 0 0 0 0 0 1 1 1 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 > > 0 0 0 0 0 0 0 0 0 1 -1 0 1 -1 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 > > 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 -1 -1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 > > 0 0 0 0 0 0 0 0 0 1 0 -1 1 0 -1 1 0 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 > 0 > > is it correct? > > > > Any help will be very appreciated. > > > > Best wishes, > > > > Bo Xiang > > > > > > > > > > _______________________________________________ > 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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