bronch                 package:MCPAN                 R Documentation

_B_r_o_n_c_h_i_a_l _c_a_r_c_i_n_o_m_a _d_a_t_a

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

     Data of a long term rodent carcinogenicity study of bronchial
     carcinoma.

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

     data(bronch)

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

     A data frame with 200 observations on the following 3 variables.

     '_g_r_o_u_p' a factor with levels '0' '1' '2' '3', labelling the
          control and the three dose groups

     '_Y' a logical vector, indicating whether a tumour was present at
          time of death (if TRUE), or not (if FALSE) 

     '_t_i_m_e' a numeric vector, the time of death, counted in days? from
          begin of the study

_D_e_t_a_i_l_s:

     Not yet checked for consistency with the source!

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

     ...

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

     ...

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

     data(bronch)
     # raw tumour counts:

     table(bronch[c("group","Y")])

     # groupwise times of death:

     boxplot(time ~ group, data=bronch, horizontal=TRUE)

