varFunc                 package:nlme                 R Documentation

_V_a_r_i_a_n_c_e _F_u_n_c_t_i_o_n _S_t_r_u_c_t_u_r_e

_D_e_s_c_r_i_p_t_i_o_n:

     If 'object' is a one-sided formula, it is used as the argument to
     'varFixed' and the resulting object is returned. Else, if 'object'
     inherits from class 'varFunc', it is returned unchanged.

_U_s_a_g_e:

     varFunc(object)

_A_r_g_u_m_e_n_t_s:

  object: either an one-sided formula specifying a variance covariate,
          or an object inheriting from class 'varFunc', representing a
          variance function structure.

_V_a_l_u_e:

     an object from class 'varFunc', representing a variance function
     structure.

_A_u_t_h_o_r(_s):

     Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates
     bates@stat.wisc.edu

_S_e_e _A_l_s_o:

     'summary.varFunc', 'varFixed', 'varWeights.varFunc',
     'coef.varFunc'

_E_x_a_m_p_l_e_s:

     vf1 <- varFunc(~age)