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Max > I am trying to figure out which set of contrast codes is correct to > examine the effect illness while controlling for age. The order of the > columns in the attached screen shots is age, illness and task. there are 3 columns only so suppose 1st is age, 2nd illness - the 3rd one has 1s everywhere, i.e. this is your constant (mean) - correct contrast is the 2nd one [0 1 0] showing the unique variance explained by illness, age effect being taken into account. C > <http://www.ICUdelirium.org> > > ------------------------------------------------------------------------ > > > ------------------------------------------------------------------------ > -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.