This function evaluates initial parameter estimates for a nonlinear
regression model. If data is a parameterized data frame or
pframe object, its parameters attribute is returned.
Otherwise the object is examined to see if it contains a call to a
selfStart object whose initial attribute can be
evaluated.
Usage
getInitial(object, data, ...)
Arguments
object
a formula or a selfStart model that defines a
nonlinear regression model
data
a data frame in which the expressions in the formula or
arguments to the selfStart model can be evaluated
...
optional additional arguments
Value
A named numeric vector or list of starting estimates for the
parameters. The construction of many selfStart models is such
that these "starting" estimates are, in fact, the converged parameter
estimates.