Initialize.reStruct           package:nlme           R Documentation

_I_n_i_t_i_a_l_i_z_e _r_e_S_t_r_u_c_t _O_b_j_e_c_t

_D_e_s_c_r_i_p_t_i_o_n:

     Initial estimates for the parameters in the 'pdMat' objects
     forming 'object', which have not yet been initialized, are
     obtained using the methodology described in Bates and Pinheiro
     (1998). These estimates may be refined using a series of EM
     iterations, as described in Bates and Pinheiro (1998). The number
     of EM iterations to be used is defined in 'control'.

_U_s_a_g_e:

     ## S3 method for class 'reStruct':
     Initialize(object, data, conLin, control, ...)

_A_r_g_u_m_e_n_t_s:

  object: an object inheriting from class 'reStruct', representing a
          random effects structure and consisting of a list of 'pdMat'
          objects.

    data: a data frame in which to evaluate the variables defined in
          'formula(object)'.

  conLin: a condensed linear model object, consisting of a list with
          components '"Xy"', corresponding to a regression matrix ('X')
          combined with a response vector ('y'), and '"logLik"',
          corresponding to the log-likelihood of the underlying model.

 control: an optional list with a single component 'niterEM'
          controlling the number of iterations for the EM algorithm
          used to refine initial parameter estimates. It is given as a
          list for compatibility with other 'Initialize' methods.
          Defaults to 'list(niterEM = 20)'.

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

_V_a_l_u_e:

     an 'reStruct' object similar to 'object', but with all 'pdMat'
     components initialized.

_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:

     'reStruct', 'pdMat', 'Initialize'