Description Format Source References Examples
The data comes from a unpublished master's paper by Carl Hoffstedt.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.
This data frame contains the following columns:
average daily traffic count in thousands
truck volume as a percent of the total volume
total number of lanes of traffic
number of access points per mile
number of signalized interchanges per mile
number of freeway-type interchanges per mile
speed limit in 1973
length of the highway segment in miles
lane width, in feet
width in feet of outer shoulder on the roadway
An indicator of the type of roadway or the source of funding for the road; 0 if MC, 1 if FAI, 2 if PA, 3 if MA
1973 accident rate per million vehicle miles
Carl Hoffstedt
Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Section 7.2.
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ADT Trks Lane Acpt Sigs Itg Slim Len Lwid Shld Hwy Rate
1 69 8 8 4.6 0.00 1.20 55 4.99 12 10 1 4.58
2 73 8 4 4.4 0.00 1.43 60 16.11 12 10 1 2.86
3 49 10 4 4.7 0.00 1.54 60 9.75 12 10 1 3.02
4 61 13 6 3.8 0.00 0.94 65 10.65 12 10 1 2.29
5 28 12 4 2.2 0.00 0.65 70 20.01 12 10 1 1.61
6 30 6 4 24.8 1.84 0.34 55 5.97 12 10 2 6.87
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