corNatural  R Documentation 
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
Initialize.corNatural
,
pdNatural
,
summary.corNatural
## covariate is observation order and grouping factor is Subject
cs1 < corNatural(form = ~ 1  Subject)
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