Specify optimization options that are to be passed to the numerical estimation routines
| 1 2 | optimOptions(tol = 0.01, maxIter = 20, LMinit = 0.01, LMstep = 2,
  display = c("off", "on")[1])
 | 
| tol | Minimum 2-norm of the gradient (Default:  | 
| maxIter | Maximum number of iterations to be performed | 
| LMinit | Starting value of search-direction length 
in the Levenberg-Marquardt method (Default:  | 
| LMstep | Size of the Levenberg-Marquardt step (Default:  | 
| display | Argument whether to display iteration details or not
(Default:  | 
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