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.
motorThis data frame contains the following columns:
timesThe time in milliseconds since impact.
accelThe recorded head acceleration (in g).
strataA numeric column indicating to which of the three strata (numbered 1, 2 and 3) the observations belong.
vAn 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.
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.