what is the random effect what is the random effect of an error term what's the random effect in a rm model? what model has a random effect why is $y_ij cov(y_ij, y_ik) constant why does $rm cov(y_ij, y_ik) = sigma_u2$ why does $rm cov(y_ij, y_ik) if value is zero then the random effect is the same as the ______ why would the model of the random effect be ________. what is the randomness of the error term why does $rm cov(Y_ij, Y_ik) = sigma_u2$ in the model $y_ij why does $rm cov(Y_ij, Y_ik) = sigma_u2$ in the model what is the random effect of e_aij what is the model of random effect for sigma_ui why does y_eij mean e-e-ij what is the random effect of a random variable what is the function of $y_j in the model of a random effect? if y_ij is a constant what is the random effect why does $y_ij=sigma_u$ why does y_ij = sigma_u2$