Suppose the autoregressive error process for the model is that given by (12.11)
a. What would be the transformed variables and for whieh the random term in the regression model are uncorrelated?
b. How would you estimate the parameters ρ1 and ρ2 for use with the Cochrane-Orcutt procedure?
c. HQW would you estimate the parameters ρ1 and ρ2 with the Hildreth-Lu procedure?