

   DDaattaa ffrroomm aa SSiimmuullaatteedd MMoottoorrccyyccllee AAcccciiddeenntt

   AArrgguummeennttss::

      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.

   SSUUMMMMAARRYY::

        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

   DDAATTAA DDEESSCCRRIIPPTTIIOONN::

        This data frame contains the following columns:

   SSOOUURRCCEE::

        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.

   OOTTHHEERR RREEFFEERREENNCCEESS::

        Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Meth-
        ods and Their Application. Cambridge University Press.

        Venables, W.N. and Ripley, B.D. (1994) Modern Applied
        Statistics with S-Plus. Springer-Verlag.

   SSeeee AAllssoo::

        `mcycle'

