nlme (version 3.1-99)

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 class 'reStruct':
pdFactor(object)

Arguments

object

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

Value

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

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

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