searchdrc                package:drc                R Documentation

_S_e_a_r_c_h_i_n_g _t_h_r_o_u_g_h _a _r_a_n_g_e _o_f _i_n_i_t_i_a_l _p_a_r_a_m_e_t_e_r _v_a_l_u_e_s _t_o _o_b_t_a_i_n _c_o_n_v_e_r_g_e_n_c_e

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

     'searchdrc' provides a facility for searching through a range of
     parameter values (one-dimensional) in order to obtain convergence
     of the estimation procedure.

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

     searchdrc(object, which, range, len = 50)

_A_r_g_u_m_e_n_t_s:

  object: an object of class 'drc'. The object can be from a model that
          could not fitted.

   which: a character string containing the parameter name

   range: a numeric vector of length 2 specifying the interval
          endpoints for the range.

     len: numeric. The number of points in the interval.

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

     The function goes through the range with increments such that in
     total at most 'len' sets of parameter values are used as initial
     values for the estimation procedure. You would need to identify
     the parameter which is most likely to cause problems for the
     estimation procedure.

_V_a_l_u_e:

     An object of class 'drc'.

_A_u_t_h_o_r(_s):

     Christian Ritz

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

     ## No example yet

