Returns the numerical partial derivate of y wrt x for a point of interest.

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`x` |
a numeric vector. |

`y` |
a numeric vector. |

`order` |
integer; Controls the number of partial moment quadrant means. Defaults to |

`stn` |
numeric [0,1]; Signal to noise parameter, sets the threshold of |

`eval.point` |
numeric; |

`deriv.order` |
numeric options: (1,2); 1 (default) For second derivative estimate of |

`h` |
numeric [0,...]; Percentage step used for finite step method. Defaults to |

`noise.reduction` |
the method of determing regression points options: ("mean","median","mode","off"); In low signal to noise situations, |

`deriv.method` |
method of derivative estimation "NNS","FS"; Determines the partial derivative from the coefficient of the NNS.reg output when |

Returns the value of the partial derivative estimate for the given order.

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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