pls, can you help me out on how you obtained the Pac model (4,2,1) and (9,2,1) from the graph?Thanks..

Am new to this.. ]]>

After making the time series stationary for all the variables, the next step is to select those variables for the regression analysis that becomes stationary after first or second differentiation. Separate models can be formed using the values of first and second order differentiation.Following this,we have to select the best ARIMA model using the AIC and BIC criteria.

]]>after perform unit root test and make the time series stationary how to perform the regression. what would be the variables?

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