Hi Lee, Thank you for your reply. I had read the example tables, but I'm still not sure how to alter them into my study.May be you could help to check the matrix I designed and tell me my mistake? 3 classes ( A / B / C group) and 4 variables (gender, age, education, and Moca test score). group.diff.mtx 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 group-x-gender.mtx 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 group-x-age.mtx 0 0 0 0 0 0 1 -1 0 0 0 0 0 0 0 group-x-education.mtx 0 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 group-x-moca.mtx 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 group-x-gender-x-age-x-education.mtx 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 group-x-gender-x-age-x-education-x-moca.mtx 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 -1 0
group.diff.mtx also can write as: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 group-x-age.mtx aslo can write as: 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 Thank you in advence. Wishes, Li > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of Freesurfer digest..." > > >Today's Topics: > > 1. Re: How to create a 3g4v matrix (Lee Tirrell) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Mon, 23 Nov 2015 10:27:42 -0500 (EST) >From: Lee Tirrell <ltirr...@nmr.mgh.harvard.edu> >Subject: Re: [Freesurfer] How to create a 3g4v matrix >To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> >Message-ID: > <alpine.lrh.2.20.1511231020130.5...@vermis.nmr.mgh.harvard.edu> >Content-Type: text/plain; charset="iso-8859-7" > >Hi Li, > >You can find some example FSGD tables here, which you can alter to fit your >analyses. > >https://surfer.nmr.mgh.harvard.edu/fswiki/FsgdExamples > >Best, >Lee > >On Sun, 22 Nov 2015, nellie wrote: > >> >> Hi Freesurfer Experts, >> >> I?m a new user of Freesurfer, and I learn how to use this software mainly >> through Wiki. When I came to the step of using GLM to compare group >> differences, I was confused on the design of 3g4v matrix. In my study, there >> were 3 classes ( >> A / B / C group) and 4 concomitant?variables (gender, age, education, and >> Moca test score). It?s supposed to be 15 regressors in this design, but I >> don?t know how to use the numbers (like 1, -1, 0, 0.5, -0.5, etc.) to create >> a correct >> matrix. I wonder if you could provide a 3g4v matrix in detail for me. I?ll >> be grateful if you can help. I hope I?m not bothering you too much, and I?m >> looking for your reply. >> >> Best wishes, >> >> Li? >> >> >> >> ? >> >> >> > >------------------------------ > >_______________________________________________ >Freesurfer mailing list >Freesurfer@nmr.mgh.harvard.edu >https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > >End of Freesurfer Digest, Vol 141, Issue 40 >******************************************* > > >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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