Use the data for the year 1990 in INFMRT.RAW for this exercise.
(i) Reestimate equation, but now include a dummy variable for the observation on the District of Columbia (called DC). Interpret the coefficient on DC and com¬ment on its size and significance.
= 33.86 - 4.68 log(pcinc) + 4.15 log(physic)
(20.43) (2.60) (1.51)
_.088 log(popul)
(.287)
n = 51, R2=139,R2=.084.
(ii) Compare the estimates and standard errors from part (i) with those from equation. What do you conclude about including a dummy variable for a single observation?
=23.95-.57 log(pcinc)-2.74 log(physic)
(12.42) (1.64) (1.19)
+.629 log(popul)
(.191)
n = 50, R2= .273,2 =.226s.
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