The data comes from a unpublished master's paper by Carl Hoffstedt.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,
Shld that are under the control of
the highway department, on accidents.
This data frame contains the following columns:
1973 accident rate per million vehicle miles
length of the
Highway1segment in miles
average daily traffic count in thousands
truck volume as a percent of the total volume
(number of signalized interchanges per mile times len + 1)/len, the number of signals per mile of roadway, adjusted to have no zero values.
speed limit in 1973
width in feet of outer shoulder on the roadway
total number of lanes of traffic
number of access points per mile
number of freeway-type interchanges per mile
lane width, in feet
An indicator of the type of roadway or the source of funding for the road, either MC, FAI, PA, or MA
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.