nlme (version 3.1-163)

as.matrix.corStruct: Matrix of a corStruct Object

Description

This method function extracts the correlation matrix, or list of correlation matrices, associated with object.

Usage

# S3 method for corStruct
as.matrix(x, ...)

Value

If the correlation structure includes a grouping factor, the returned value will be a list with components given by the correlation matrices for each group. Otherwise, the returned value will be a matrix representing the correlation structure associated with

object.

Arguments

x

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

...

further arguments passed from other methods.

Author

José Pinheiro and Douglas Bates

References

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York.

See Also

corClasses, corMatrix

Examples

cst1 <- corAR1(form = ~1|Subject)
cst1 <- Initialize(cst1, data = Orthodont)
as.matrix(cst1)