AtraAlt                 package:NADA                 R Documentation

_A_t_r_a_z_i_n_e _c_o_n_c_e_n_t_r_a_t_i_o_n_s _i_n _N_e_b_r_a_s_k_a _g_r_o_u_n_d _w_a_t_e_r - _A_l_t_e_r_n_a_t_i_v_e

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

     Alternative Atrazine concentrations altered from the Atra data set
     so that there are more nondetects, adding a second detection limit
     at 0.05.

     Objective is to determine if concentrations increase from June to
     September. There are two detection limits, at 0.01 and 0.05 ug/L. 
     Used in Chapters 5 and 9 of the NADA book.

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

     data(AtraAlt)

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

     Altered from the data of Junk et al., 1980, Journal of
     Environmental Quality 9, pp. 479-483.

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

     Helsel, Dennis R. (2005).  Nondectects and Data Analysis;
     Statistics for censored environmental data.  John Wiley and Sons,
     USA, NJ.

