varWeights               package: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', representing 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 Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

_R_e_f_e_r_e_n_c_e_s:

     Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S
     and S-PLUS", Springer.

_S_e_e _A_l_s_o:

     'logLik.varFunc',  'varWeights'

_E_x_a_m_p_l_e_s:

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

