Kristine/Doug, Are you missing Dependent Variable values or Independent Variable Values?
If you are missing some IV values, there are two potential solutions: (1) Drop the subject; (2) Impute the value of that subject given other variables and relationships of those variables and the variable with the missing value. If you are missing some DV values, the easiest solution would be to use GLM_Flex ( http://nmr.mgh.harvard.edu/harvardagingbrain/People/AaronSchultz/GLM_Flex.html ). The one caveat of GLM_Flex is that we don't have a computation for surface smoothness yet, we should probably talk to Doug about the best way to deal with this issue. Another caveat is that it won't be useable in some of the freesurfer viewing tools (such as qdec as the file structure of the model is different), but contrasts can be viewed with tksurfer. One other caveat, the output of GLM_Flex is T/F-statistics, not log-transformed p-values as is traditionally done in Freesurfer. I think that this will be updated at some point in the future. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Postdoctoral Research Fellow, GRECC, Bedford VA Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Website: http://www.martinos.org/~mclaren Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Fri, Feb 24, 2012 at 3:27 PM, Kristine Beate Walhovd < k.b.walh...@psykologi.uio.no> wrote: > Hi, > > we´re running FS 5.1 and have a data set with a lot of missing values. > There are different subsets of persons missing different values of > interest, and we´re running analyses on concat files. mri_glmfit not > qdec). Is there anyway we can run analyses w/ missings in the fsgd file? > > Best, > > Kristine > > > _______________________________________________ > 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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