General correlation in natural parameterization
This function is a constructor for the corNatural
class,
representing a general correlation structure in the “natural”
parameterization, which is described under pdNatural
.
Objects created using this constructor must later be
initialized using the appropriate Initialize
method.
corNatural(value, form, fixed)
value |
an optional vector with the parameter values. Default is
|
form |
a one sided formula of the form |
fixed |
an optional logical value indicating whether the
coefficients should be allowed to vary in the optimization, or kept
fixed at their initial value. Defaults to |
an object of class corNatural
representing a general correlation
structure.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
## covariate is observation order and grouping factor is Subject cs1 <- corNatural(form = ~ 1 | Subject)
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