申論題

5. (22 points) Suppose the model of interest is. The OLS cstimation may suffer some problems, because assumptions of classical linear regression model (CLRM) do not hold.

(b) (12 points) If the assumption of classical linear regression model,does not hold.
 i. (4 points) What problem the OLS estimation suffers?
 ii. (4 points) Assuming,the Durbin-Watson d test can be used to test this problem. Please show the Durbin-Watson d statistic.

 iii. (4 points) If we find d=3.5. Please comment on the test result.