varComb                 package:nlme                 R Documentation

_C_o_m_b_i_n_a_t_i_o_n _o_f _V_a_r_i_a_n_c_e _F_u_n_c_t_i_o_n_s

_D_e_s_c_r_i_p_t_i_o_n:

     This function is a constructor for the 'varComb' class,
     representing a combination of variance functions. The
     corresponding variance function is equal to the product of the
     variance functions of the 'varFunc' objects listed in '...'.

_U_s_a_g_e:

     varComb(...)

_A_r_g_u_m_e_n_t_s:

     ...: objects inheriting from class 'varFunc' representing variance
          function structures.

_V_a_l_u_e:

     a 'varComb' object representing a combination of variance
     functions, also inheriting from class 'varFunc'.

_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:

     'varClasses', 'varWeights.varComb', 'coef.varComb'

_E_x_a_m_p_l_e_s:

     vf1 <- varComb(varIdent(form = ~1|Sex), varPower())