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> To: freesurfer@nmr.mgh.harvard.edu > From: gr...@nmr.mgh.harvard.edu > Date: Thu, 9 Jun 2016 16:33:48 -0400 > Subject: Re: [Freesurfer] contrast > > > > On 06/08/2016 11:40 PM, Dave Yas wrote: > > Thank you very much Dough! > > > > I need to check 4 contrasts. I made them based on the freesurfer page, > > but cant decide if i interpreted them right! > > Are my contrasts Ok? > > > > If classes are: > > Patients, healthy control > > > > and variables are: > > Age, TIV, father age, mother age. > > > > Are these contrasts ok? > > > > R# = 2* (4+1) = 10 > > > > *contrast1:* 0 0 0 0 0 0 -1 1 -1 1>> checking the differences between > > groups in terms of father and mother age regression out the effect of > > age and TIV > That will effectively compute the difference between the mean(father > age + mother age), ie, it would be like analyzing with a regressor > created by adding the father age and mother age (ie, mean parent age). > Is that what you want? > > > > *contrast2:* 0 0 0 0 0 0 -1 1 0 0 > > 0 0 0 0 0 0 0 0 1 -1 >> checking the differences > > between groups in terms of father or mother age regression out the > > effect of age and TIV > This will be significant if either the father age is diff OR the mother > age is diff (or some combination thereof). It will be similar to > contrast1 but not identical. > > > > *contrast3:* 0 0 0 0 0 0 -1 1 0 0 >> checking the differences between > > groups in terms of father age regression out the effect of age and TIV > > and mother age > Yes > > > > *contrast4: *0 0 0 0 0 0 0 0 -1 1 >> checking the differences between > > groups in terms of mother age regression out the effect of age and TIV > > and father age > Yes > > > > Yas > > > > > > > > ------------------------------------------------------------------------ > > To: freesurfer@nmr.mgh.harvard.edu > > From: gr...@nmr.mgh.harvard.edu > > Date: Wed, 8 Jun 2016 09:38:18 -0400 > > Subject: Re: [Freesurfer] Coordinate system in mris_convert > > > > > > Try the group analysis tutorial > > http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis > > > > On 6/8/16 2:39 AM, Dave Yas wrote: > > > > Hello all, > > > > I'm new to surface analysis. > > > > I have 2 groups (patient and healthy control) that i want to check > > differences between. > > I want to perform cortical thickness/ surface analysis. > > My categories are > > Patients, healthy control, age, TIV, father age, mother age. > > Where age & TIV are covariates of no interest. and father and > > mother age are covariates of interest. > > > > I have already preprocessed the data (recon-all), but how can i > > proceed? > > Any online guide on steps for surface analysis? also making a > > design such as the above? > > > > Yas > > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > > > > > > _______________________________________________ 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. > > > > > > _______________________________________________ > > 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
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