which model can use sball what is gam2a what is the parameter of random effect gam2 does sbal have a random effect why use random effects in gam how is random effects calculated what is random effect gam2a can gam plot with random effects what model does random effects fall under how to select random variables what is gam2a why is it good for the residuals in agams to be random which parameter is used for random effects how do i select the random effects of gam what is gam2a why gam is better than aic which model shows heterogeneity how to select random effects from agam is gam a normal or random effect gam2 is what type of model