how to use mixed model what is the mixed model in math what is a mixed model for time, age, and treatment what is the model of the age attracted in r how to do multiple measures r is age a fixed or multilevel variable what is lmer what is the lmer model for the random effect in r how to construct mixed model of time in r what is the variable of interest in the model, dv how is age treated in a mixed model in r what is the difference between a group and a time variable how to construct a mixed model of data using lmer what is the difference between group and time in a mixed model is a mixed model of time, age and treatment in the same variable? how do you describe a mixed model in r what model can be used for a multilevel research what is mixed model for dv can time be used for a mixed model how to set pre and post measures of a study in R