Determines numerical derivative of a given function using projected secant lines on the y-axis. These projected points infer finite steps `h`

, in the finite step method.

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`f` |
Function to be derived. Does not have to be defined |

`point` |
Point to be evaluated for derivative of a given function |

`h` |
Initial step for secant projection. Defaults to 0.1. |

`tol` |
Sets the tolerance for the stopping condition of the inferred h. |

`print.trace` |
Displays the iteration, lower y-intercept, upper y-intercept and inferred h. Defaults to |

Returns a matrix of values, intercepts, derivatives, inferred step sizes for multiple methods of estimation.

Fred Viole, OVVO Financial Systems

Viole, F. and Nawrocki, D. (2013) "Nonlinear Nonparametric Statistics: Using Partial Moments" http://amzn.com/1490523995

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