Hello all! When you are working with a little more complicated models in SAS PROC MIXED, you often use the /ddfm=satterth call to make sure the df decomposition is done the best way possible. Running the same models in lme, without any special calls, results in warning messages about the df handling. Is anybody out there working with something like the /ddfm=satterth? It would be handy, or are there any reasons not to use it? /CG CG Pettersson, MSci, PhD Stud. Swedish University of Agricultural Sciences Dep. of Ecology and Crop Production. Box 7043 SE-750 07 Uppsala