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The following set of questions is related to the matrix approach to multiple regression models. (10 points) (ECONOMETRICS) a. Explain how U'U differs from UU'
The following set of questions is related to the matrix approach to multiple regression models. (10 points) (ECONOMETRICS)
a. Explain how U'U differs from UU'
b. Use the UU' matrix to illustrate homoscedascitity
c. Use the UU' matrix to illustrate the case heteroscedasticity
d. Explain what var-cov (b) matrix is and show it.
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