

varWeights(nlme)                             R Documentation

_E_x_t_r_a_c_t _V_a_r_i_a_n_c_e _F_u_n_c_t_i_o_n _W_e_i_g_h_t_s

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

     The inverse of the standard deviations corresponding to
     the variance function structure represented by `object'
     are returned.

_U_s_a_g_e_:

     varWeights(object)

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

  object: an object inheriting from class `varFunc', repre-
          senting a variance function structure.

_V_a_l_u_e_:

     if `object' has a `weights' attribute, its value is
     returned; else `NULL' is returned.

_A_u_t_h_o_r_(_s_)_:

     Jose Pinheiro and Douglas Bates

_S_e_e _A_l_s_o_:

     `logLik.varFunc'

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

     library(nlme)
     data(Orthodont)
     vf1 <- varPower(form=~age)
     vf1 <- initialize(vf1, Orthodont)
     coef(vf1) <- 0.3
     varWeights(vf1)[1:10]

