Hi Nicola and SPMers,
I have a similar question.
I serched the archives looking how to specify nuisance variables using SPM5
and was not able to have find an answer... Looking at the SPM5 Manual it
says (under covariate):
"This option allows for the specification of covariates and nuisance
variables. Unlike SPM94/5/6, where the design was partitioned into effects
of interest and nuisance effects for the computation of adjusted data and
the F-statistic (which was used to thresh out voxels where there appeared
to be no effects of interest), SPM5 does not partition the design in this
way. The only remaining distinction between effects of interest (including
covariates) and nuisance effects is their location in the design matrix,
which we have retained for continuity. Pre-specified design matrix
partitions can be entered."
But I am still having problem to actually set up the desing matrix with a
nuisance variable.
I am probably doing a weird mistake, but any sugestion how to do it?
Thanks in advance,
Jorge
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