| nls.lm | Addresses NLS problems with the Levenberg-Marquardt algorithm |
| nls.lm.control | Control various aspects of the Levenberg-Marquardt algorithm |
| nlsLM | Standard 'nls' framework that uses 'nls.lm' for fitting |
| wfct | Weighting function that can be supplied to the 'weights' argument of 'nlsLM' or 'nls' |