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...group - at least I think so) and random parameter ID)? Or is there a more simple possibility? Perhaps somebody can recommend a book or weblink where these different strategies of analysing are discussed - preferable with examples with raw data which I can recalculate. And if there is the R syntax includede - this would be best! Any help will be appreciate! Thanks! Karl

...model$scanner)), b=list(group="Group1", task="20outcome", scanner=levels(my.model$scanner))) print(con) ## the code below wont execute becasue the contrast call above will ## error out ### not what I want but just to show that it works when scanner is not ### includede in the model cat("### Without scanner\n") fixedFormula=as.formula("fmri ~ group * task") randomFormula = as.formula("random = ~ 1 | subject") mylme = lme(fixed=fixedFormula, random=randomFormula, data=my.model) con=contrast( mylme, a=list(group="Group1",...