

varFunc(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 `var-
     Func', 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 struc-
          ture.

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

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

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

     Jose Pinheiro and Douglas Bates

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

     `varFixed', `varWeights.varFunc', `coef.varFunc'

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

     library(nlme)
     vf1 <- varFunc(~age)

