what is the random effect formula of r what is mixed model in r and what is a random effect what is mixed model and random effect what are the differences between a mixed and a random effect which random effect has one operator in r what is the difference between a mixed and a random effect in r? is there only one operator in the mixed model? what is the difference between a mixed model and a random effect what does mixed model do r what is the difference between a mixed model and a random effect in a graph r scf number of operators what is the difference between a mixed model and a random effect? what is the difference between a mixed model and a random effect? mixed model compared to random effects what is the difference between a mixed and random sample when mixed model runs in r what is the difference between random and fixed results why is mixed modeling compared to random what is the difference between a mixed model and a random random effect? what kind of interaction between random effects and mixed models in r r variable which has only one operator