Hello, I would like to fit several responses depending on the same parameters. Thus I generate an mlm object. On the other hand, for further analysis, I would like to be able to simplify as much as possible the models. Of course, there is no reason that the same formula applies for every response. That is why I wonder if it exist a method such as drop1 for mlm objects. Waiting for your help, Thanks in advance, Isabelle. Isabelle Zabalza-Mezghani IFP Rueil-Malmaison / France