r how to find independent variables for arma models what kind of model is a random interaction in r how to fit different arma models by group in r can we fit different r models for each group how to use autoregressive model with different groups cortana, how to fit a lognormal model using r what is r lme used for what is symetric dependence in r how to fit different ar models by group what is autoregressive dependency different ar orders per subject in r different r parameters how to fit different arma models can r use auto regression r do lognormal and autoregressive models have different orders? how to model different groups in r which model allows different autoregressives to differ by subject in r how to fit different arma models by group in r can you use ar for autogressive dependence different r models