logLik.varFunc             package:nlme             R Documentation

Extract varFunc logLik

Description:

     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.

Usage:

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

Arguments:

  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.

Value:

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

Author(s):

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

Examples:

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

