logDet.corStruct            package:nlme            R Documentation

Extract corStruct Log-Determinant

Description:

     This method function extracts the logarithm of the determinant of
     a square-root factor of the correlation matrix associated with
     'object', or the sum of the log-determinants of square-root
     factors of the list of correlation matrices associated with
     'object'.

Usage:

     ## S3 method for class 'corStruct':
     logDet(object, covariate, ...)

Arguments:

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

covariate: an optional covariate vector (matrix), or list of covariate
          vectors (matrices), at which values the correlation matrix,
          or list of correlation  matrices, are to be evaluated.
          Defaults to 'getCovariate(object)'.

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

Value:

     the log-determinant of a square-root factor of the correlation
     matrix associated with 'object', or the sum of the
     log-determinants of square-root factors of the list of correlation
     matrices associated with 'object'.

Author(s):

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

See Also:

     'logLik.corStruct', 'corMatrix.corStruct'

Examples:

     cs1 <- corAR1(0.3)
     logDet(cs1, covariate = 1:4)

