gravity                 package:boot                 R Documentation

Acceleration Due to Gravity

Description:

     The 'gravity' data frame has 81 rows and 2 columns.

     The 'grav' data set has 26 rows and 2 columns.

     Between May 1934 and July 1935, the National Bureau of Standards
     in Washington D.C. conducted a series of experiments to estimate
     the acceleration due to gravity, _g_, at Washington.  Each
     experiment produced a number of replicate estimates of _g_ using
     the same methodology.  Although the basic method remained the same
     for all experiments, that of the reversible pendulum, there were
     changes in configuration.

     The 'gravity' data frame contains the data from all eight
     experiments.  The 'grav' data frame contains the data from the
     experiments 7 and 8.  The data are expressed as deviations from
     980.000 in centimetres per second squared.

Usage:

     data(gravity)

Format:

     This data frame contains the following columns:

     'g' The deviation of the estimate from 980.000 centimetres per
          second squared.

     'series' A factor describing from which experiment the estimate
          was derived.

Source:

     The data were obtained from

     Cressie, N. (1982) Playing safe with misweighted means.  _Journal
     of the American Statistical Association_, *77*, 754-759.

References:

     Davison, A.C. and Hinkley, D.V. (1997)  _Bootstrap Methods and
     Their Application_. Cambridge University Press.

