Question: Using the U.S. gasoline data in Chapter 4, problem 15 given in Table 4.2 and obtained from the USGAS.ASC file, estimate the following two models:
Using the U.S. gasoline data in Chapter 4, problem 15 given in Table 4.2 and obtained from the USGAS.ASC file, estimate the following two models:
Static: log
QMG CAR
t
= γ1 + γ2log
RGNP POP
t
+ γ3log
CAR POP
t
+γ4log
PMG PGNP
t
+ t Dynamic: log
QMG CAR
t
= γ1 + γ2log
RGNP POP
t
+ γ3
CAR POP
t
+γ4log
PMG PGNP
t
+ λlog
QMG CAR
t−1
+ t
(a) Compare the implied short-run and long-run elasticities for price (PMG) andincome (RGNP).
(b) Compute the elasticities after 3, 5 and 7 years. Do these lags seem plausible?
(c) Can you apply the Durbin-Watson test for serial correlation to the dynamic version of this model? Perform Durbin’s h-test for the dynamic gasoline model. Also, the Breusch-Godfrey test for first-order serial correlation.
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