pdFactor.reStruct: Extract Square-Root Factor from Components of an reStruct...
In nlme: Linear and Nonlinear Mixed Effects Models
pdFactor.reStruct R Documentation
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.
Note
This function is used intensively in optimization
algorithms and its value is returned as a vector for efficiency
reasons. The pdMatrix function can be used to obtain
square-root factors in matrix form.
Author(s)
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
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdFactor(rs1)
nlme documentation built on Nov. 27, 2023, 5:09 p.m.
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| pdFactor.reStruct | R Documentation |
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 |
Value
a vector with square-root factors of the positive-definite matrices
corresponding to the elements of object stacked column-wise.
Note
This function is used intensively in optimization
algorithms and its value is returned as a vector for efficiency
reasons. The pdMatrix function can be used to obtain
square-root factors in matrix form.
Author(s)
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
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont))
pdFactor(rs1)
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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