On 11/27/2015 08:42 PM, nellie wrote: > Hi expert, > Thank you for your reply. I had read the example tables, but I'm still > not sure how to alter them into my analysis.Can you help me to check > the matrix I designed and point out my mistakes? Thanks in advence. > 3 classes ( A / B / C group) and 4 variables (gender, age, education, and > Moca test score). Gender has to be specified as a group, so you will have 6 classes (A-male, A-female, etc) > group.diff.mtx 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 This would only test the difference between A and B. If you wan to look for an effect of group, then you will need a 2nd row which is 1 0 -1 000 000 000 000 > 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 Same as above. You need a 2nd row to each of these > 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 These two will be easier when you get the other matrices sorted out > 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 This does not compute a group difference, it looks for any voxel where any group or combination of groups is different than 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 same as above > > . > 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 > ><mailto:ltirr...@nmr.mgh.harvard.edu>> > >Subject: Re: [Freesurfer] How to create a 3g4v matrix > >To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu > ><mailto:freesurfer@nmr.mgh.harvard.edu>> > >Message-ID: > > <alpine.lrh.2.20.1511231020130.5...@vermis.nmr.mgh.harvard.edu > <mailto: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 <mailto: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. > > > > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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