This method function converts
object into a
corBandNat
object, represented in a natural parameterization. If
unconstrained = TRUE
, an unconstrained parameterization based
on the logit of the correlations
(log((1+r)/(1-r)), with r denoting
the correlation) is used. If
unconstrained
is set to
FALSE, the (constrained)
correlations are used to parameterize the returned
corBandNat
object. This
corStruct class does not define an unrestricted
parameterization and, thus, should NOT be used for optimization. It
is mostly used for deriving approximate confidence intervals on
parameters following the optimization of an objective function.
USAGE:
corBandNat(object, unconstrained)
REQUIRED ARGUMENTS:
object
an object inheriting from class
corBand,
representing a banded correlation structure, whose
representation is to be converted to a natural parameterization.
OPTIONAL ARGUMENTS:
unconstrained
an optional logical value indicating whether the
natural parameterization should be unconstrained. Defaults to
TRUE.
VALUE:
an object of class
corBandNat representing a general
correlation structure in natural parameterization.