While on the topic of future qdec versions: Is there any plan to develop a qdec that would support simultaneous analysis of the left and right hemisphere in a repeated measure type framework? (e.g., so that you could easily create statistical maps of the main effect of group, the main effect of hemisphere, and group x hemisphere interaction).
thanks, Mike H. On Tue, 2008-03-18 at 14:46 -0400, Nick Schmansky wrote: > Jerry, > > It boils down to a GUI issue, that we are working to eliminate in the > next qdec release (that is, eliminate the limitation of four > regressors). > > The problem is that qdec currently automatically generates all possible > contrast matrices for the specified up-to 4 regressors. The questions > associated with each contrast are also automatically generated. Beyond > four regressors, you begin to have enormous numbers of possibilities > (hundreds to thousands), which makes automatic generation, calculation, > and display, of all possibilities too unwieldy. > > The next qdec will include a Contrast tab, so that prior to running the > design, you would select from a list the contrasts that you want to keep > (and of those, only the small ones will have the human-readable > questions associated with it). Until then, you would have to run via > the command-line (ie create your own contrast matrices) to make use of > more than four regressors. > > Nick > > > On Tue, 2008-03-18 at 14:10 -0400, Jerry Yeou-Wei Chen wrote: > > Hello, > > I would like to know why we are limited to 4 regressors in the design > > specification within the QDEC GUI. > > If I understand correctly, there is no such limitation in the "old" > > method (via command line). > > Thanks, > > - Jerry > > _______________________________________________ > > Freesurfer mailing list > > 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 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
