The data comes from a unpublished master's paper by Carl Hoffstedt.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.
Arguments
Format
This data frame contains the following columns:
adt
average daily traffic count in thousands
trks
truck volume as a percent of the total volume
lane
total number of lanes of traffic
acpt
number of access points per mile
sigs
number of signalized interchanges per mile
itg
number of freeway-type interchanges per mile
slim
speed limit in 1973
len
length of the Highway segment in miles
lwid
lane width, in feet
shld
width in feet of outer shoulder on the roadway
htype
An indicator of the type of roadway or the source of funding
for the road; "mc" for major collector, "fai" for Federal interstate highways,
"pa" for principal arterial highway, and "ma" for major arterial highways
rate
1973 accident rate per million vehicle miles
Source
Carl Hoffstedt
References
Weisberg, S. (2014). Applied Linear Regression, 4th
edition. Hoboken NJ: Wiley.