Thank you Michael for your explanations, that is exactly the way I understood DODS and DOSS. I am planning to present DOSS and DODS results in comparison and wanted to explain both models in a similar manner that you have done it here. But as these DOSS and DODS terms are kind of unique to Freesurfer and might not be known to readers not using Freesurfer I felt I had to show where I found these expressions and that I did not invent these terms.
Best wishes, Christian Scheel Am 01.02.2011 22:18, schrieb Michael Harms: > > It really is just a matter of justifying and explaining your chosen > statistical model. If you believe that two groups have the same > regression slope for a parameter (but possibly different > offsets/intercepts), then you would use a "DOSS" model -- this is akin > to a model in SPSS/SAS in which you model a main effect of group and a > single (main) effect of the regressor that applies to all subjects > (e.g., Y = group age). If you believe that the two groups might > possibly have a different slope, then you would use a "DODS" model (also > known as a heterogeneous slopes model) -- this is equivalent to a model > in SPSS/SAS in which you model a main effect of group (different > offsets/intercepts) and separate (heterogeneous) slopes for the two > groups i.e,. you model a possible interaction between group and slope; Y > = group age group*age). > > cheers, > -MH > > On Tue, 2011-02-01 at 20:49 +0100, Christian Scheel wrote: >> Dear all, >> >> does anyone know one or two good method papers to cite when describing >> the difference of DOSS and DODS? I have already screened Pubmed and Co. >> but did not really find anything convincing. >> >> Any help greatly appreciated! >> >> Best wishes, >> Christian Scheel >> >> _______________________________________________ >> 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
