terbuthylazin              package:drc              R Documentation

_T_h_e _e_f_f_e_c_t _o_f _t_e_r_b_u_t_h_y_l_a_z_i_n _o_n _g_r_o_w_t_h _r_a_t_e

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

     Test on the effect of terbuthylazin on  _Lemna minor_, performed
     on an aseptic culture according to the OECD-guidelines.

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

     data(terbuthylazin)

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

     A data frame with 30 observations on the following 2 variables.

     _d_o_s_e a numeric vector of dose values.

     _r_g_r a numeric vector of relative growth rates.

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

     Dose is 

                              mu l^{-1}

     and rgr is the relative growth rate of _Lemna_.

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

     Cedergreen N. (2004). Unpublished bioassay data.

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

     ## displaying first 6 rows of the data set
     head(terbuthylazin)

     ## Fitting log-logistic model
     terbuthylazin.m1 <- drm(rgr~dose, data = terbuthylazin, fct = LL.4())
     summary(terbuthylazin.m1)

     ## Fitting log-logistic model
     ##  with Box-Cox transformation
     terbuthylazin.m2 <- boxcox(terbuthylazin.m1, method = "anova")
     summary(terbuthylazin.m2)

