kidney               package:survival               R Documentation

_K_i_d_n_e_y _d_a_t_a _f_r_o_m _s_u_r_v_i_v_a_l_5

_D_e_s_c_r_i_p_t_i_o_n:

     Data on the recurrence times to infection, at the point of
     insertion of the catheter, for kidney patients using portable
     dialysis equipment. Catheters may be removed for reasons other
     than infection, in which case the observation is censored.  Each
     patient has exactly 2 observations.

_F_o_r_m_a_t:


       patient:  id
       time:     time
       status:   event status
       age:      in years
       sex:      1=male, 2=female
       disease:  disease type (0=GN, 1=AN, 2=PKD, 3=Other)
       frail:    frailty estimate from original paper

_N_o_t_e:

     The original analysis had incorrect handling of ties and so is not
     exactly reproduced by survival.

_S_o_u_r_c_e:

     McGilchrist and Aisbett, Biometrics 47, 461-66, 1991

_E_x_a_m_p_l_e_s:

     data(kidney)
     kfit <- coxph(Surv(time, status)~ age + sex + disease + frailty(id), kidney)
     kfit0 <- coxph(Surv(time, status)~ age + sex + disease, kidney)
     kfitm1 <- coxph(Surv(time,status) ~ age + sex + disease + 
                     frailty(id, dist='gauss'), kidney)