traffic2: traffic2

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

traffic2

Description

Wooldridge Source: P.S. McCarthy (1994), “Relaxed Speed Limits and Highway Safety: New Evidence from California,” Economics Letters 46, 173-179. Professor McCarthy kindly provided the data. Data loads lazily.

Usage

data('traffic2')

Format

A data.frame with 108 observations on 48 variables:

• year: 1981 to 1989

• totacc: statewide total accidents

• fatacc: statewide fatal accidents

• injacc: statewide injury accidents

• pdoacc: property damage only accidents

• ntotacc: noninterstate total acc.

• nfatacc: noninterstate fatal acc.

• ninjacc: noninterstate injur acc.

• npdoacc: noninterstate property acc.

• rtotacc: tot. acc. on rural 65 mph roads

• rfatacc: fat. acc. on rural 65 mph roads

• rinjacc: inj. acc. on rural 65 mph roads

• rpdoacc: prp. acc. on rural 65 mph roads

• ushigh: acc. on U.S. highways

• cntyrds: acc. on county roads

• strtes: acc. on state routes

• t: time trend

• tsq: t^2

• unem: state unemployment rate

• spdlaw: =1 after 65 mph in effect

• beltlaw: =1 after seatbelt law

• wkends: # weekends in month

• feb: =1 if month is Feb.

• mar:

• apr:

• may:

• jun:

• jul:

• aug:

• sep:

• oct:

• nov:

• dec:

• ltotacc: log(totacc)

• lfatacc: log(fatacc)

• prcfat: 100*(fatacc/totacc)

• prcrfat: 100*(rfatacc/rtotacc)

• lrtotacc: log(rtotacc)

• lrfatacc: log(rfatacc)

• lntotacc: log(ntotacc)

• lnfatacc: log(nfatacc)

• prcnfat: 100*(nfatacc/ntotacc)

• lushigh: log(ushigh)

• lcntyrds: log(cntyrds)

• lstrtes: log(strtes)

• spdt: spdlaw*t

• beltt: beltlaw*t

• prcfat_1: prcfat[_n-1]

Notes

Many states have changed maximum speed limits and imposed seat belt laws over the past 25 years. Data similar to those in TRAFFIC2.RAW should be fairly easy to obtain for a particular state. One should combine this information with changes in a state’s blood alcohol limit and the passage of per se and open container laws.

Used in Text: pages 378-379, 409, 443, 674, 695-696

Source

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

Examples

 str(traffic2)

wooldridge documentation built on May 3, 2023, 5:06 p.m.