how does the nrm model work what type of function is a nonlinear function? what is the difference between an overall fit and a linear fit? how to fit nonlinear random effects function in r how many independent variables in an r function which linear function is associated with the inverse of random effect? what is the model specification of random effects what is the nonlinear model specific for random effects? r linear regression model what does it do what is the function gbrk what is the function of the linear random effects model what is nra model what does l3 mean what is the function for a nonlinear random effect model? what model does l3 fit how to fit linear models how do i make fit in r what is the function of r? what is mdbrk mean if a linear function is a nonlinear random effect