I have been trying to work out a comparatuve model forecast usung ARIMA and ARIMAX. The model, both for within and out-of-sample is fine with just a univariate CPI variable.

On repeating the process with one exogenous variable for the ARIMAX model, I don't seem to be getting anything for the out-of-sample forecast.

I'm not sure if the steps I am using are correct.

Similar questions and discussions