Re: [R] lme random effects in additive models with interaction

Thanks for your answer, I would like to make clear my question: My data is like following and there is a response variable y: Time Size Charge Density Replication 3 small + low 1 . .

[R] lme random effects in additive models with interaction

Hello, I work with a mixed model with 4 predictor variables Time, Size, Charge, Density and Size, Charge, Density are factors, all with two levels. Hence I want to put their interactions with Time into the model. But, I have two data sets (Replication 1 and 2) and I want that Replication is random