Data from a Simulated Motorcycle Accident

SUMMARY:
       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.
       ~give succinct details here

DATA DESCRIPTION:
       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  non-parametric  curve  fitting.
       Journal of the Royal Statistical Society, B, 47, 1-52.

OTHER 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:
       mcycle