Re: [R] R Arimax Function

Hello Mark, Thank you for your timely reply. All I want to know is if the xreg argument must contain the same amount of historical observations as the dependent variable and if newxreg has to have a forecast of the exogenous variable equal to the number of periods to be forecasted. Best regards

[R] R Arimax Function

Hello everyone, I am just trying to understand how the Arimax function works, so my questions are: 1. If I have a univariate time series of sales and sales are dependent upon, say inflation rates, then my xreg would be inflation rates right? 2. Now is I have historial data on sales (from january