Initialize.corStruct          package:nlme          R Documentation

Initialize corStruct Object

Description:

     This method initializes 'object' by evaluating its associated
     covariate(s) and grouping factor, if any is present, in 'data',
     calculating various dimensions and constants used by optimization
     algorithms involving 'corStruct' objects (see the appropriate
     'Dim' method documentation), and assigning initial values for the
     coefficients in 'object', if none were present.

Usage:

     ## S3 method for class 'corStruct':
     Initialize(object, data, ...)

Arguments:

  object: an object inheriting from class 'corStruct' representing a
          correlation structure.

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

     ...: this argument is included to make this method compatible with
          the generic.

Value:

     an initialized object with the same class as 'object' representing
     a correlation structure.

Author(s):

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

References:

     Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S
     and S-PLUS", Springer.

See Also:

     'Dim.corStruct'

Examples:

     cs1 <- corAR1(form = ~ 1 | Subject)
     cs1 <- Initialize(cs1, data = Orthodont)

