beetGrowth                package:drc                R Documentation

_E_x_a_m_p_l_e _o_f _p_l_a_n_t _g_r_o_w_t_h _c_u_r_v_e _f_r_o_m _C_o_v_a_r_e_l_l_i _a_n_d _O_n_o_f_r_i (_1_9_9_8)

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

     Crop weight (grams per square meter of dry matter) was recorded at
     several times after plant emergence

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

     data(beetGrowth)

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

     A data frame with 186 observations on the following 3 variables.

     '_D_A_E' a numeric vector

     '_w_e_i_g_h_t_I_n_f' a numeric vector

     '_w_e_i_g_h_t_F_r_e_e' a numeric vector

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

     Covarelli G. and Onofri A., 1998. Effects of timing of weed
     removal and emergence in sugarbeet.  Proceedings 6th EWRS
     Mediterranea Symposium, Montpellier, 65-72.

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

     model <- drm(weightInf ~ DAE, data  = beetGrowth, fct=gompGrowth.1())
     plot(model, log="")
     summary(model)

