nlme (version 3.1-164)

pdFactor.reStruct: Extract Square-Root Factor from Components of an reStruct Object

Description

This method function extracts square-root factors of the positive-definite matrices corresponding to the pdMat elements of object.

Usage

# S3 method for reStruct
pdFactor(object)

Value

a vector with square-root factors of the positive-definite matrices corresponding to the elements of object stacked column-wise.

Arguments

object

an object inheriting from class "reStruct", representing a random effects structure and consisting of a list of pdMat objects.

Author

José Pinheiro and Douglas Bates bates@stat.wisc.edu

References

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

See Also

pdFactor, pdMatrix.reStruct, pdFactor.pdMat

Examples

Run this code
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdFactor(rs1)

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