Is training a within subject factor or between? If between, then you can do it as a two group design as I described in a post yesterday. doug
On 10/17/2012 08:04 PM, Harry Hallock [hhal5293@uni.sydney.edu.au] wrote:
Hi Doug,
Is it possible to add an extra factor to this repeated measures fsgd format, such as training and non-training. As ideally we are also trying to find interactions between groups and time.
Cheers, Harry ________________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu] Sent: Wednesday, 17 October 2012 4:29 AM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Mixed-effects models for longitudinal data analysis in Freesurfer
If you want to do a repeated measures ANOVA with more than two time points, I've put a page together here:
http://surfer.nmr.mgh.harvard.edu/fswiki/RepeatedMeasuresAnova
doug
On 10/15/2012 08:24 PM, Harry Hallock [hhal5293@uni.sydney.edu.au] wrote:
Hi Martin,
If you could make available that lme toolbox link, that would be great! Thanks for the help.
Cheers, Harry
*From:* jorge luis [jbernal0019@yahoo.es] *Sent:* Tuesday, 16 October 2012 8:16 AM *To:* Martin Reuter; Harry Hallock [hhal5293@uni.sydney.edu.au] *Cc:* freesurfer@nmr.mgh.harvard.edu *Subject:* Mixed-effects models for longitudinal data analysis in Freesurfer
Hi Harry
As Martin said, longitudinal linear mixed-effects models (lme) are the recommended tool for analyzing longitudinal data obtained from the Freesurfer longitudinal image processing pipeline. The increase in power can be dramatic. Coming up there is a paper about this subject. We are working on making our lme tools available and easy to use but in the mean time, if you are interested, I can make available a link for you to download our Matlab-based lme toolbox.
Best -Jorge
------------------------------------------------------------------------ *De:* Martin Reuter<mreuter@nmr.mgh.harvard.edu> *Para:* Harry Hallock<hhal5293@uni.sydney.edu.au>; Douglas N Greve<greve@nmr.mgh.harvard.edu>; "freesurfer@nmr.mgh.harvard.edu"<freesurfer@nmr.mgh.harvard.edu> *Enviado:* Domingo 14 de octubre de 2012 21:06 *Asunto:* Re: [Freesurfer] 3 Factor glm group analysis Hi Harry. I have some scripts to compute a slope into the time thickness or volume (linear fits) and then run a standard glm on that . However, we recommend to run a linear mixed effects model (external software). We are working on making that available. Best Martin Harry Hallock<hhal5293@uni.sydney.edu.au> wrote: Thanks Doug! If i wanted to add a third time-point, what would u suggest would be a good method to use for time x group interaction? Harry ------------------------------------------------------------------------ From: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu] on behalf of Douglas N Greve [greve@nmr.mgh.harvard.edu] Sent: Wednesday, 10 October 2012 1:10 AM To: freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] 3 Factor glm group analysis Hi Harry, I would do a time1-time2 subtraction (fscalc) and then do a 2 group analysis (search for "paired" on our wiki). doug On 10/09/2012 12:45 AM, hhal5293@uni.sydney.edu.au wrote: Hello, We are currently doing a longitudinal Group Analysis using FreeSurfer, and were wondering if there is a way to run a 3 factor design (time is 2 levels, group is 2 levels, subject is 10 levels) using the mri_glmfit model, as i want to test the time by group interaction? Is there a way of writing this model in an FSDG file? If we can't do this using mri_glmfit, is it possible to do this using QDEC? Regards, Harry ------------------------------------------------------------------------ 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 greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs:surfer.nmr.mgh.harvard.edu/fswiki/BugReporting<http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop:www.nmr.mgh.harvard.edu/facility/filedrop/index.html<http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> ------------------------------------------------------------------------ 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 -- Sent from my phone, please excuse brevity. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu<mailto: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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-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
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