deterioration           package:DPpackage           R Documentation

_T_i_m_e _t_o _C_o_s_m_e_t_i_c _D_e_t_e_r_i_o_r_a_t_i_o_n _o_f _B_r_e_a_s_t _C_a_n_c_e_r _P_a_t_i_e_n_t_s

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

     This data set considers information of time to cosmetic
     deterioration of the breast for  women with Stage 1 breast cancer
     who have undergone a lumpectomy, for two treatments, these being
     radiation, and radiation coupled with chemotherapy. There is
     interest in the cosmetic impact of  the treatments because both
     are considered very effective in preventing recurrence of this
     early  stage cancer. The data come from a retrospective study of
     46 patients who received radiation  only and 48 who received
     radiation plus chemotherapy. Each woman made a series of visits to
     a  clinician, who determined whether or not retraction had
     occurred. If it had, the time of retraction  was known only to lie
     between the time of the present and last visits. The data set is
     presented in  Beadle et al. (1984a,b) and also given in
     Finkelstein and Wolfe (1985).

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

     data(deterioration)

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

     A data frame with 94 observations on the following 3 variables.

     '_l_e_f_t' a numeric vector giving the left limit of the interval

     '_r_i_g_h_t' a numeric vector giving the right limit of the interval

     '_t_r_t' a numeric vector giving the treatment (0 = radiation only, 
          1 = radiation plus chemotherapy)

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

     Beadle, G., Come, S., Henderson, C., Silver, B., and Hellman, S.
     (1984a). The effect of adjuvant chemotherapy on the cosmetic
     results after primary radiation treatment for early stage breast
     cancer. International Journal of Radiation Oncology, Biology and
     Physics,  10: 2131-2137.

     Beadle, G., Harris, J., Silver, B., Botnick, L., and Hellman, S.
     (1984b). Cosmetic results following primary radiation therapy for
     early breast cancer. Cancer, 54: 2911-2918.

     Finkelstein, D.M. and Wolfe, R.A. (1985). A semiparametric model
     for regression analysis of interval-censored failure time data.
     Biometrics, 41: 933-945.

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

     Hanson, T., and Johnson, W. (2004) A Bayesian Semiparametric AFT
     Model for Interval-Censored Data. Journal of Computational and
     Graphical Statistics,  13: 341-361.

_E_x_a_m_p_l_e_s:

     data(deterioration)
     ## maybe str(deterioration) ; plot(deterioration) ...

