cement                 package:boot                 R Documentation

_C_e_m_e_n_t _C_o_m_p_o_s_i_t_i_o_n _D_a_t_a

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

     The `cement' data frame has 13 rows and 5 columns.

     13 samples of Portland cement were set. For each sample, the
     percentages of the four main chemical ingredients was accurately
     measured.  While the cement was setting the amount of heat evolved
     was also measured.

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

     data(cement)

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

     This data frame contains the following columns:

     `_x_1' The percentage by weight of tricalcium aluminate in the
          sample.

     `_x_2' The percentage by weight of tricalcium silictate in the
          sample.

     `_x_3' The percentage by weight of tricalcium alumino ferrite in the
          sample.

     `_x_4' The percentage by weight of dicalcium silictate in the
          sample.

     `_y' The heat (in calories per gramme of cement) evolved while the
          sample was  setting.

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

     The data were obtained from

     Woods, H., Steinour, H.H. and Starke, H.R. (1932) Effect of
     composition of  Portland cement on heat evolved during hardening. 
     Industrial Engineering and Chemistry, 24, 1207-1214.

_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.

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

