Wooldridge Source: Jiyoung Kwon, a former doctoral student in economics at MSU, kindly provided these data, which she obtained from the Domestic Airline Fares Consumer Report by the U.S. Department of Transportation. Data loads lazily.
A data.frame with 4596 observations on 14 variables:
year: 1997, 1998, 1999, 2000
id: route identifier
dist: distance, in miles
passen: avg. passengers per day
fare: avg. one-way fare, $
bmktshr: fraction market, biggest carrier
y98: =1 if year == 1998
y99: =1 if year == 1999
y00: =1 if year == 2000
concen: = bmktshr
This data set nicely illustrates the different estimates obtained when applying pooled OLS, random effects, and fixed effects.
Used in Text: pages 506-507, 581
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