nitrofen                package:boot                R Documentation

_T_o_x_i_c_i_t_y _o_f _N_i_t_r_o_f_e_n _i_n _A_q_u_a_t_i_c _S_y_s_t_e_m_s

_D_e_s_c_r_i_p_t_i_o_n:

     The 'nitrofen' data frame has 50 rows and 5 columns.

     Nitrofen is a herbicide that was used extensively for the control
     of  broad-leaved and grass weeds in cereals and rice. Although it
     is relatively non-toxic to adult mammals, nitrofen is a
     significant tetragen and mutagen. It is also acutely toxic and
     reproductively toxic to cladoceran zooplankton. Nitrofen is no
     longer in commercial use in the U.S., having been the first
     pesticide to be withdrawn due to tetrogenic effects.

     The data here come from an experiment to measure the reproductive
     toxicity of nitrofen on a species of zooplankton (_Ceriodaphnia
     dubia_).  50 animals were randomized into batches of 10 and each
     batch was put in a solution with a measured concentration of
     nitrofen.  Then the number of live offspring in each of the three
     broods to each animal was recorded.

_U_s_a_g_e:

     nitrofen

_F_o_r_m_a_t:

     This data frame contains the following columns:

     '_c_o_n_c' The nitrofen concentration in the solution (mug/litre).

     '_b_r_o_o_d_1' The number of live offspring in the first brood.

     '_b_r_o_o_d_2' The number of live offspring in the second brood.

     '_b_r_o_o_d_3' The number of live offspring in the third brood.

     '_t_o_t_a_l' The total number of live offspring in the first three
          broods.

_S_o_u_r_c_e:

     The data were obtained from

     Bailer, A.J. and Oris, J.T. (1994) Assessing toxicity of
     pollutants in aquatic  systems. In _Case Studies in Biometry_. N.
     Lange, L. Ryan, L. Billard, D. Brillinger, L. Conquest and J.
     Greenhouse (editors), 25-40. John Wiley.

_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.