oops sorry! (I also miscalculated the # of regressors - there's actually 12 (not 10 as previously noted). Here is the list of column labels: Grp1male Grp1female Grp2male Grp2female Grp1maleVar1 Grp1femaleVar1 Grp1maleVar2 Grp1femaleVar2 Grp2maleVar1 Grp2femaleVar1 Grp2maleVar2 Grp2femaleVar2
And what I think is actually an F test looking for group x var 1 interaction OR group x variable 2 interaction whilst accounting for gender. .5 .5 -.5 -.5 0 0 0 0 0 0 0 0 0 0 0 0 .5 .5 -.5 -.5 But what I actually WANT to test is a multiple regression style model - i.e. if I put var 1 AND 2 into the model together do they explain more variance than either variable alone, AND does this vary by group (is this even a sensible contrast to make?). Which I *think* would look something like this... 0 0 0 0 .125 .125 .125 .125 .125 .125 .125 .125 Laura. On Thu, Mar 21, 2013 at 5:51 PM, MCLAREN, Donald <mclaren.don...@gmail.com>wrote: > Please include the list of the column labels. > > Best Regards, Donald McLaren > ================= > D.G. McLaren, Ph.D. > Research Fellow, Department of Neurology, Massachusetts General Hospital > and > Harvard Medical School > Postdoctoral Research Fellow, GRECC, Bedford VA > 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 Thu, Mar 21, 2013 at 6:43 PM, Laura M. Tully < > tully.la...@googlemail.com> wrote: > >> hi Experts, >> >> I'm struggling to conceptualize the appropriate contrasts for my cortical >> thickness analysis. I have four classes [two groups; two levels >> (patients,controls; male,female) and two behavioral variables. I want to >> see if together the two variables account significant proportion of the >> variance in y (thickness) and if this differs by group whilst regressing >> out gender. - i.e. if I enter both behavioral variables into the model does >> it account for more variance than either variable on their own (after >> controlling for gender)? What I have is this: >> >> .5 .5 -.5 -.5 0 0 0 0 >> 0 0 0 0 .5 .5 -.5 -.5 >> >> Does this look right? >> >> Thanks! >> >> Laura. >> >> >> >> >> -- >> -- >> Laura M. Tully, MA >> Social Neuroscience & Psychopathology, Harvard University >> Center for the Assessment and Prevention of Prodromal States, UCLA Semel >> Institute of Neuroscience >> ltu...@mednet.ucla.edu >> ltu...@fas.harvard.edu >> 310-267-0170 >> -- >> My musings as a young clinical scientist: >> http://theclinicalbrain.blogspot.com/ >> Follow me on Twitter: @tully_laura >> >> _______________________________________________ >> 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. >> >> > -- -- Laura M. Tully, MA Social Neuroscience & Psychopathology, Harvard University Center for the Assessment and Prevention of Prodromal States, UCLA Semel Institute of Neuroscience ltu...@mednet.ucla.edu ltu...@fas.harvard.edu 310-267-0170 -- My musings as a young clinical scientist: http://theclinicalbrain.blogspot.com/ Follow me on Twitter: @tully_laura
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