when to use auto.arima function what is an auto.arima when does r autoarima forecast which function is used to show correlated forecasts in r what is auto.arima function what is r predicting errors what is the prediction error in r which function gives prediction errors in r why is the prediction error correlated in r? is auto arima a linear function what is auto.arima what is the function for auto.arima what is auto.arima how to fix prediction error correlation can you predict prediction errors in r what is prediction error correlated? how to predict prediction error based on a regression model what do arima predictions look like what is auto.arima in r what is the arima function