

   AAcccceelleerraattiioonn DDuuee ttoo GGrraavviittyy

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

          g: The deviation of the estimate from 980.000 cen-
             timetres per second squared.

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

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

        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 grav-
        ity, g, at Washington.  Each experiment produced a num-
        ber of replicate estimates of g using the same method-
        ology.  Although the basic method remained the same for
        all experiments, that of the reversible pendulum, there
        were changes in configuration.

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

   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

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

   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.

