what function is used to tell the variable id function to find random effect what is ranef function ranef function r definition can ranef be fixed or random which function is used in r in random effect analysis? r do random effect functions mean how to find the coefficients of variable in r what function gives random id what is the random coefficient of the ranef function what is ranef in r what is the difference between ranef and lmer what is the ranef function in r what is the function of ranef in r how to do ranef in r what is lmer in r? what is r's fixed effect function how to do ranef function in R what is the random effect function which r function gives random and fixed coefficients?