leuk                  package:boot                  R Documentation

_S_u_r_v_i_v_a_l _T_i_m_e_s _a_n_d _W_h_i_t_e _B_l_o_o_d _C_o_u_n_t_s _f_o_r _L_e_u_k_a_e_m_i_a _P_a_t_i_e_n_t_s

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

     The `leuk' data frame has 33 rows and 3 columns.

     Survival times are given for 33 patients who died from acute
     myelogenous  leukaemia.  Also measured was the patient's white
     blood cell count at the time of diagnosis.  The patients were also
     factored into 2 groups according to the presence or absence of a
     morphologic characteristic of white blood cells.   Patients termed
     AG positive were identified by the presence of Auer rods  and/or 
     significant granulation  of the leukaemic cells in the bone marrow
     at  the time of diagnosis.

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

     data(leuk)

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

     This data frame contains the following columns:

     `_w_b_c' White blood cell count.

     `_a_g' Factor describing the patients group according to the test
          described above. Levels are `present' and `absent'.

     `_t_i_m_e' Survival time in weeks after diagnosis.

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

     The data were obtained from

     Feigl, P. and Zelen, M. (1965) Estimation of exponential survival 
     probabilities with concomitant information. Biometrics, 21, 
     826-838.

_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.

