ARMAX Model Question, assignment help

Use the data attached to answer these questions

(a) Specify, estimation, fit, and justify your “best” ARMAX(p,q) model for how the covariates in the data file explain presidential approval over the sample period.

(b) Present your alternative models, which work to and justify your final model. This should be done using a table of results / estimates as would be presented in a leading political science or economics journal. This would / should be a table that compares models, their uncertainty, and overall fit to the data in a sensible way (consult your favorite empirical journal for examples). You also need to “write-up” or explain the table to the reader.