In: Advanced Math
Consider the following regression results of B for time series data. The dependent variable is the log of real consumption and the regressors are all lagged by one period. The coefficients are estimated by OLS method. *, **, and *** indicate that the coefficients are significant at the 10%, 5%, and 1% level, respectively. The F- test in the last row tests the joint hypothesis that all the coefficients except the constant are zero and their p-values are provided in the table. The empty space means that the variables are not included in the regression. (4) 3.1213*** 3.8876*** (1) Constant log(Real Income) 0.8683* Interest Rate Inflation Rate log(Stock Price) F-test 0.082 (2) (3) 3.3962*** 3.8115*** 0.6289*** 0.6341*** -0.2680** -0.2402** 0.5233 0.5230 -0.2504*** 0.6237 0.4775 0.064 0.095 0.044 (a) Why do we have to include lagg values of regressors in the equation? (b) Compare the results of equations (1) and (2) and make any comments. (c) Compare the results of equations (2) and (3) and make any comments. (d) Compare the results of equations (3) and (4) and make any comments.