what type of model does a random grouping factor a have if random effects of random variables set up a random mixed effects model with random effects in r how to fit a random variable r what variables are in r mixed effects? how to set up random random effects how to set up a mixed effect model in r r mixed effects model set can i use df and site in mixed effect in r why use r mixed effects what is the random variable in r how to set up a random model in r can i use nlme to find random effects what variable fits in r with random effects how to set up a nonlinear mixed effects model what is the nlme for mixed effects how to set up a mixed effect model what variables can be used to set random effects in r how to set up a non-linear mixed effects model nlme random effect model