# motor

##### Data from a Simulated Motorcycle Accident

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.

- Keywords
- datasets

##### Usage

`motor`

##### 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.

##### 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 S-Plus*. Springer-Verlag.

##### See Also

*Documentation reproduced from package boot, version 1.3-24, License: Unlimited*