logLik.varFunc             package:nlme             R Documentation

_E_x_t_r_a_c_t _v_a_r_F_u_n_c _l_o_g_L_i_k

_D_e_s_c_r_i_p_t_i_o_n:

     This method function extracts the component of a Gaussian
     log-likelihood associated with the variance function structure
     represented by 'object', which is equal to the sum of the
     logarithms of the corresponding weights.

_U_s_a_g_e:

     ## S3 method for class 'varFunc':
     logLik(object, data, ...)

_A_r_g_u_m_e_n_t_s:

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

    data: this argument is included to make this method function
          compatible with other 'logLik' methods and will be ignored.

     ...: some methods for this generic require additional arguments. 
          None are used in this method.

_V_a_l_u_e:

     the sum of the logarithms of the weights corresponding to the
     variance function structure represented by 'object'.

_A_u_t_h_o_r(_s):

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

_E_x_a_m_p_l_e_s:

     vf1 <- varPower(form = ~age)
     vf1 <- Initialize(vf1, Orthodont)
     coef(vf1) <- 0.1
     logLik(vf1)

