| glsStruct | R Documentation | 
A generalized least squares structure is a list of model components
representing different sets of parameters in the linear 
model. A glsStruct  may contain corStruct and
varFunc objects. NULL arguments are not included in the
glsStruct list. 
glsStruct(corStruct, varStruct)
| corStruct | an optional  | 
| varStruct | an optional  | 
a list of model variance-covariance components determining the parameters to be estimated for the associated linear model.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
corClasses,
gls,
residuals.glsStruct,
varFunc 
gls1 <- glsStruct(corAR1(), varPower())
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