nassCDS {DAAGxtras}R Documentation

Airbag and other influences on accident fatalities

Description

US data, for 1997-2002, from police-reported car crashes in which there is a harmful event (people or property), and from which at least one vehicle was towed. Data are restricted to front-seat occupants, include only a subset of the variables recorded, and are restricted in other ways also.

Usage

nassCDS

Format

A data frame with 26217 observations on the following 14 variables.

dvcat
ordered factor with levels (estimated impact speeds) 1-9km/h, 10-24, 25-39, 40-54, 55+
weight
Weight that should be attached to observation, in order to account for sampling probability in a probabilistic sampling scheme
dead
factor with levels alive dead
airbag
a factor with levels none airbag
seatbelt
a factor with levels none belted
frontal
a numeric vector; 0 = non-frontal, 1=frontal impact
sex
a factor with levels f m
ageOFocc
age of occupant in years
yearacc
year of accident
yearVeh
Year of model of vehicle; a numeric vector
abcat
Did one or more (driver or passenger) airbag(s) deploy? This factor has levels deploy nodeploy unavail
occRole
a factor with levels driver pass
deploy
a numeric vector: 0 if an airbag was unavailable or did not deploy; 1 if one or more bags deployed.
injSeverity
a numeric vector; 0:none, 1:possible injury, 2:no incapacity, 3:incapacity, 4:killed; 5:unknown, 6:prior death

Details

Data were collected according to a multi-stage sampling scheme. Hence the need to weight observations by the inverse of the selection probability, called the national inflation factor (national) in the original data from NASS. These data include a subset of the variables from the nass9702cor dataset. Variables that are coded here as factors are coded as numeric values in that dataset.

Source

http://www.stat.uga.edu/~mmeyer/airbags.htm

ftp://ftp.nhtsa.dot.gov/nass/

See also http://www.maths.anu.edu.au/~johnm/datasets/airbags

References

Meyer, M.C. and Finney, T. (2005): Who wants airbags?. Chance 18:3-16.

Farmer, C.H. 2006. Another look at Meyer and Finney's ‘Who wants airbags?’. Chance 19:15-22.

Meyer, M.C. 2006. Commentary on "Another look at Meyer and Finney's 'Who wants airbags?'". Chance 19:23-24.

Examples

data(nassCDS)
xtabs(weight ~ dead + airbag, data=nassCDS)
xtabs(weight ~ dead + airbag + seatbelt + dvcat, data=nassCDS)
tab <- xtabs(weight ~ dead + abcat, data=nassCDS,
             subset=dvcat=="25-39"&frontal==0)[, c(3,1,2)]
round(tab[2, ]/apply(tab,2,sum)*100,2)

[Package DAAGxtras version 0.7-5 Index]