cement                 package:MASS                 R Documentation

_H_e_a_t _E_v_o_l_v_e_d _b_y _S_e_t_t_i_n_g _C_e_m_e_n_t_s

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

     Experiment on the heat evolved in the setting of each of 13
     cements.

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

     data(cement)

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

     `_x_1, _x_2, _x_3, _x_4' Proportions (%) of active ingredients

     `_y' heat evolved in cals/gm

_D_e_t_a_i_l_s:

     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.

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

     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:

     Hald, A. (1957) Statistical Theory with Engineering Applications.
     Wiley, New York.

_E_x_a_m_p_l_e_s:

     data(cement)
     lm(y ~ x1 + x2 + x3 + x4, cement)

