cohorts                 package:aod                 R Documentation

_A_g_e, _P_e_r_i_o_d _a_n_d _C_o_h_o_r_t _E_f_f_e_c_t_s _f_o_r _V_i_t_a_l _R_a_t_e_s

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

     Number of prostate cancer deaths and midperiod population for
     nonwhites in the USA by age and period. The cohort index k is
     related to age and period indices (i and j, respectively) by k = j
     + I - i,  where I = max(i) (Holford, 1983, Table 2).

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

     data(cohorts)

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

     A data frame with 49 observations on the following 4 variables.

     _p_e_r_i_o_d A factor with levels '1935-', '1940-', ..., '1965-'.

     _a_g_e A factor with levels '50-', '55-', ..., '80-'.

     _y Numeric: the number of prostate cancer deaths.

     _n Numeric: the midperiod population size.

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

     Holford, T.R., 1983. _The estimation of age, period and cohort
     effects for vital rates_. Biometrics 39, 311-324.

