rats                package:survival                R Documentation

_R_a_t _d_a_t_a _f_r_o_m _G_a_i_l _e_t _a_l.

_D_e_s_c_r_i_p_t_i_o_n:

     48 rats were injected with a carcinogen, and then randomized to
     either drug or placebo.  The number of tumors ranges from 0 to 13;
     all rats were  censored at 6 months after randomization.

_U_s_a_g_e:

     rats

_F_o_r_m_a_t:


       rat:          id
       rx:           treatment,(1=drug, 0=control)
       observation:  within rat
       start:        entry time
       stop:         exit time
       status:       event status

_S_o_u_r_c_e:

     MH Gail, TJ Santner, and CC Brown (1980), An analysis of
     comparative carcinogenesis experiments based on multiple times to
     tumor. _Biometrics_ *36*, 255-266.