Highway1: Highway Accidents

Description

The data comes from a unpublished master's paper by Carl Hoffstedt. They relate the automobile accident rate, in accidents per million vehicle miles to several potential terms. The data include 39 sections of large highways in the state of Minnesota in 1973. The goal of this analysis was to understand the impact of design variables, Acpts, Slim, Sig, and Shld that are under the control of the highway department, on accidents.

Usage

Highway1

Arguments

Format

This data frame contains the following columns:

rate: 1973 accident rate per million vehicle miles
len: length of the Highway1 segment in miles
ADT: average daily traffic count in thousands
trks: truck volume as a percent of the total volume
sigs1: (number of signalized interchanges per mile times len + 1)/len, the number of signals per mile of roadway, adjusted to have no zero values.
slim: speed limit in 1973
shld: width in feet of outer shoulder on the roadway
lane: total number of lanes of traffic
acpt: number of access points per mile
itg: number of freeway-type interchanges per mile
lwid: lane width, in feet
hwy: An indicator of the type of roadway or the source of funding for the road, either MC, FAI, PA, or MA

Source

Carl Hoffstedt. This differs from the dataset highway in the alr3 package only by transformation of some of the columns.

References

Fox, J. and Weisberg, S. (2011) An R Companion to Applied Regression, Second Edition, Sage.

Weisberg, S. (2014) Applied Linear Regression, Fourth Edition, Wiley, Section 7.2.