
Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609
Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609 Exercise 9
Use the data in ATTEND.RAW for thiexercise.
(i) In the model of Example 6.3, argue that stndfnl/ priGPA 2 + 2 4 priGPA + 6 atndrte. Use equation (6.19) to estimate the partial effect when priGPA = 2.59 and atndrte = 82. Interpret your estimate.
(ii) Show that the equation can be written as stndfnl = 0 + 1 atndrte + 2 priGPA + 3ACT + 4 (priGPA - 2.59) 2 + 5 ACT 2 + 6 priGPA(atndrte - 82) + u,
where 2 = 2 + 2 4 (2.59) + 6 (82). (Note that the intercept has changed, but this is unimportant.) Use this to obtain the standard error of
from part (i).
(iii) Suppose that, in place of priGPA(atndrte - 82), you put (priGPA - 2.59)-(atndrte - 82). Now how do you interpret the coefficients on atndrte and priGPA
(i) In the model of Example 6.3, argue that stndfnl/ priGPA 2 + 2 4 priGPA + 6 atndrte. Use equation (6.19) to estimate the partial effect when priGPA = 2.59 and atndrte = 82. Interpret your estimate.
(ii) Show that the equation can be written as stndfnl = 0 + 1 atndrte + 2 priGPA + 3ACT + 4 (priGPA - 2.59) 2 + 5 ACT 2 + 6 priGPA(atndrte - 82) + u,
where 2 = 2 + 2 4 (2.59) + 6 (82). (Note that the intercept has changed, but this is unimportant.) Use this to obtain the standard error of

(iii) Suppose that, in place of priGPA(atndrte - 82), you put (priGPA - 2.59)-(atndrte - 82). Now how do you interpret the coefficients on atndrte and priGPA
Explanation
(i)
Hold all variables except priGPA fix...
Introductory Econometrics 4th Edition by Jeffrey Wooldridge
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