what is level 2 random effects what type of variables are tested in the random effect model? why are level 2 variables uncorrelated which predictor is level iv correlated what is level 2 variable what is the effect of level 2 random effect how do random effects assumptions affect the patient? which variable is associated with unobserved clinician characteristics why does a random effect model need correlations what is the purpose of random effects what is a level two random effects variable why does random effects model have unobserved variables what level of variability is a random effect model why are the levels of the random effects model uncorrelated which is not an unobserved clinician variable what is level 2 variable for random effects analysis why is the random effects assumption important? which type of variables are unobserved clinician variables how is random effects tested? what is level 2 variable which level of variable can be correlated with a level 1 variable?