Data from a Simulated Motorcycle Accident
Description
The motor
data frame has 94 rows and 4 columns. The rows are
obtained by removing replicate values of time
from the dataset
mcycle
. Two extra columns are added to allow for strata with
a different residual variance in each stratum.
Usage
1 
Format
This data frame contains the following columns:
times

The time in milliseconds since impact.
accel

The recorded head acceleration (in g).
strata

A numeric column indicating to which of the three strata (numbered 1, 2 and 3) the observations belong.
v

An estimate of the residual variance for the observation.
v
is constant within the strata but a different estimate is used for each of the three strata.
Source
The data were obtained from
Silverman, B.W. (1985) Some aspects of the spline smoothing approach to nonparametric curve fitting. Journal of the Royal Statistical Society, B, 47, 1–52.
References
Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.
Venables, W.N. and Ripley, B.D. (1994) Modern Applied Statistics with SPlus. SpringerVerlag.
See Also
mcycle