Melanoma package:MASS R Documentation _S_u_r_v_i_v_a_l _f_r_o_m _M_a_l_i_g_n_a_n_t _M_e_l_a_n_o_m_a _D_e_s_c_r_i_p_t_i_o_n: The 'Melanoma' data frame has data on 205 patients in Denmark with malignant melanoma. _U_s_a_g_e: Melanoma _F_o_r_m_a_t: This data frame contains the following columns: '_t_i_m_e' survival time in days, possibly censored. '_s_t_a_t_u_s' '1' died from melanoma, '2' alive, '3' dead from other causes. '_s_e_x' '1' = male, '0' = female. '_a_g_e' age in years. '_y_e_a_r' of operation. '_t_h_i_c_k_n_e_s_s' tumour thickness in mm. '_u_l_c_e_r' '1' = presence, '0' = absence. _S_o_u_r_c_e: P. K. Andersen, O. Borgan, R. D. Gill and N. Keiding (1993) _Statistical Models based on Counting Processes._ Springer.