Hi everybody I want to specify the contrasts to build a cell means model on LME when there are several fixed effect as factors in the model and also interactions between them. Can anybody give me a hint on how to do accomplish this? How can I override the default "Contr.Treatment" for linear models? I tried removing the intercept but this will only give me the mean values just for the first factor included in the model but then will use "contrast treatment" for all the other factors. Thanks for your help! Francisco _________________________________________________________________ Help protect your PC. Get a FREE computer virus scan online from McAfee.