Use the aa.varmax() function to apply the ARMA/ARIMA model to time series with multiple response variables (vector time series) or exogenous variables (variables that are independent of the other variables in the system).
Use the aa.varmax() function to apply the ARMA/ARIMA model to time series with multiple response variables (vector time series) or exogenous variables (variables that are independent of the other variables in the system).