airfare: airfare

In wooldridge: 115 Data Sets from "Introductory Econometrics: A Modern Approach, 7e" by Jeffrey M. Wooldridge

Description

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.

Usage

data('airfare')

Format

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

• ldist: log(distance)

• y98: =1 if year == 1998

• y99: =1 if year == 1999

• y00: =1 if year == 2000

• lfare: log(fare)

• ldistsq: ldist^2

• concen: = bmktshr

• lpassen: log(passen)

Notes

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

Source

https://www.cengage.com/cgi-wadsworth/course_products_wp.pl?fid=M20b&product_isbn_issn=9781111531041

Examples

 str(airfare)

Example output

'data.frame':	4596 obs. of  14 variables:
 $ year   : int  1997 1998 1999 2000 1997 1998 1999 2000 1997 1998 ...
 $ id     : int  1 1 1 1 2 2 2 2 3 3 ...
 $ dist   : int  528 528 528 528 861 861 861 861 852 852 ...
 $ passen : int  152 265 336 298 282 178 204 190 241 253 ...
 $ fare   : int  106 106 113 123 104 105 115 129 207 188 ...
 $ bmktshr: num  0.839 0.813 0.826 0.861 0.58 ...
 $ ldist  : num  6.27 6.27 6.27 6.27 6.76 ...
 $ y98    : int  0 1 0 0 0 1 0 0 0 1 ...
 $ y99    : int  0 0 1 0 0 0 1 0 0 0 ...
 $ y00    : int  0 0 0 1 0 0 0 1 0 0 ...
 $ lfare  : num  4.66 4.66 4.73 4.81 4.64 ...
 $ ldistsq: num  39.3 39.3 39.3 39.3 45.7 ...
 $ concen : num  0.839 0.813 0.826 0.861 0.58 ...
 $ lpassen: num  5.02 5.58 5.82 5.7 5.64 ...
 - attr(*, "datalabel")= chr ""
 - attr(*, "time.stamp")= chr "25 Jun 2011 23:03"
 - attr(*, "formats")= chr  "%9.0g" "%9.0g" "%9.0g" "%9.0g" ...
 - attr(*, "types")= int  252 252 252 252 252 254 254 251 251 251 ...
 - attr(*, "val.labels")= chr  "" "" "" "" ...
 - attr(*, "var.labels")= chr  "1997, 1998, 1999, 2000" "route identifier" "distance, in miles" "avg. passengers per day" ...
 - attr(*, "version")= int 10

wooldridge documentation built on Nov. 8, 2021, 9:07 a.m.