when calculating the error dft value what is the value of dft in random intercept what is the r value for a mixed model how do I calculate the size of the fixed effect in my r models average error in the random intercept model calculating error std> using mixed model analysis when to use random intercept r what are the small mixed model problems what is the dft value for a random intercept model how to calculate std random intercept model for r r how to calculate variable stan for a mixed model what is the condition of a small fixed-effect model lmer tests how does an r value change how to find the residual value of random intercept models what is the difference between a mixed model and a fixed model? how to write a r-intercept model with fixed terms what is the value for the intercept of the model? which intercept model includes a fixed-effect model? what is random intercept error