Extract Matrix or Square-Root Factor from Components of an reStruct Object
This method function extracts the positive-definite matrices
corresponding to the pdMat
elements of object
, or
square-root factors of the positive-definite matrices.
## S3 method for class 'reStruct' pdMatrix(object, factor)
object |
an object inheriting from class |
factor |
an optional logical value. If |
a list with components given by the positive-definite matrices
corresponding to the elements of object
, or square-root factors
of the positive-definite matrices.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. p. 162.
rs1 <- reStruct(pdSymm(diag(3), ~age+Sex, data = Orthodont)) pdMatrix(rs1)
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