coalminers               package:VGAM               R Documentation

_B_r_e_a_t_h_l_e_s_s_n_e_s_s _a_n_d _W_h_e_e_z_e _A_m_o_n_g_s_t _C_o_a_l_m_i_n_e_r_s

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

     Coalminers who are smokers without radiological pneumoconiosis,
     classified by age, breathlessness and wheeze.

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

     data(coalminers)

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

     A data frame with 9 age groups with the following 5 columns.

     _B_W Counts with breathlessness and wheeze. 

     _B_n_W Counts with breathlessness but no wheeze. 

     _n_B_W Counts with no breathlessness but wheeze. 

     _n_B_n_W Counts with neither breathlessness or wheeze. 

     _a_g_e Age of the coal miners (actually, the midpoints of the 5-year
          category ranges). 

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

     The data were published in Ashford and Sowden (1970). A more
     recent analysis is McCullagh and Nelder (1989, Section 6.6).

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

     Ashford, J. R. and Sowden, R. R. (1970) Multi-variate probit
     analysis. _Biometrics_, *26*, 535-546.

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

     McCullagh, P. and Nelder, J. A. (1989) _Generalized Linear
     Models_. 2nd ed. London: Chapman & Hall.

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

     data(coalminers)
     str(coalminers)

