gravity                 package:boot                 R Documentation

_A_c_c_e_l_e_r_a_t_i_o_n _D_u_e _t_o _G_r_a_v_i_t_y

_D_e_s_c_r_i_p_t_i_o_n:

     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' 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.

_U_s_a_g_e:

     data(gravity)

_F_o_r_m_a_t:

     This data frame contains the following columns:

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

     `_s_e_r_i_e_s' A factor describing from which experiment the estimate
          was derived.

_S_o_u_r_c_e:

     The data were obtained from

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

_R_e_f_e_r_e_n_c_e_s:

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

