logLik.corStruct            package:nlme            R Documentation

Extract corStruct Log-Likelihood

Description:

     This method function extracts the component of a Gaussian
     log-likelihood associated with the correlation structure, which is
     equal to the negative of the logarithm of the determinant (or sum
     of the logarithms of the determinants) of the matrix (or matrices)
     represented by 'object'.

Usage:

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

Arguments:

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

Value:

     the negative of the logarithm of the determinant (or sum of the
     logarithms of the determinants) of the correlation matrix (or
     matrices) represented by 'object'.

Author(s):

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

See Also:

     'logDet.corStruct'

Examples:

     data(Orthodont)
     cs1 <- corAR1(0.2)
     cs1 <- Initialize(cs1, data = Orthodont)
     logLik(cs1)

