Return the objective function
Arguments
x 
object to return objective function value 
type 
Objective function type value to retrieve or add.
focei For most models you can specify "focei" and it will
add the focei objective function.
nlme This switches/chooses the nlme objective function if
applicable. This objective function cannot be added if it
isn't present.
fo FO objective function value. Cannot be generated
foce FOCE object function value. Cannot be generated
laplace# This adds/retrieves the Laplace objective function value.
The # represents the number of standard deviations
requested when expanding the Gaussian Quadrature. This can
currently only be used with saem fits.
gauss#.# This adds/retrieves the Gaussian Quadrature
approximation of the objective function. The first number is the
number of nodes to use in the approximation. The second number is
the number of standard deviations to expand upon.

... 
Other arguments sent to ofv for other methods. 
Value
Objective function value
Author
Matthew Fidler