selfStart.default {nls} | R Documentation |
A method for the generic function `selfStart' for formula objects.
selfStart(model, initial, parameters, template)
model |
a function object defining a nonlinear model. |
initial |
a function object, taking three arguments: mCall ,
data , and LHS , representing, respectively, a matched
call to the function model , a data frame in
which to interpret the variables in mCall , and the expression
from the left-hand side of the model formula in the call to nls .
This function should return initial values for the parameters in
model . |
parameters, template |
these arguments are included for
consistency with the generic function, but are not used
in the default method. See the documentation on
selfStart.formula . |
a function object of class selfStart
, corresponding to a
self-starting nonlinear model function. An initial
attribute
(defined by the initial
argument) is added to the function to
calculate starting estimates for the parameters in the model
automatically.
Jose Pinheiro and Douglas Bates
# `first.order.log.model' is a function object defining a first order # compartment model # `first.order.log.initial' is a function object which calculates initial # values for the parameters in `first.order.log.model' # self-starting first order compartment model SSfol <- selfStart(first.order.log.model, first.order.log.initial)