Update varFunc Object
If the formula(object) includes a "." term, representing
a fitted object, the variance covariate needs to be updated upon
completion of an optimization cycle (in which the variance function
weights are kept fixed). This method function allows a reevaluation of
the variance covariate using the current fitted object and,
optionally, other variables in the original data.
## S3 method for class 'varFunc' update(object, data, ...)
object |
an object inheriting from class |
data |
a list with a component named |
... |
some methods for this generic require additional arguments. None are used in this method. |
if formula(object) includes a "." term, an
varFunc object similar to object, but with the
variance covariate reevaluated at the current fitted object value;
else object is returned unchanged.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
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