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On Tue, 22 Mar 2005 16:50:12 -0500, Satrajit Ghosh <[log in to unmask]> wrote: >Dear SPMusers, > >I have a study in which conditions are not balanced across runs. >Therefore, run1 may have conditions 1 and 4 and run2 may have >conditions 2 and 3. SPM complains if I set the onsets for a condition >to be empty. All it should translate to is an empty column in the >design matrix, which would be eliminated when the matrix is reduced. >The reason for entering empty conditions is that I would like to say >each run has all the conditions, but only enter events for the >conditions that actually exist in the run. > >Is this something that's part of the design intentions? Or am I doing >something incorrectly? As far as I can tell, SPM (SPM2 in my case) doesn't let one create empty columns. > >Thanks, > >Satra