Returns the estimated coefficient of variation or the unbiased estimate of the coefficient of variation.

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`C.of.V` |
Usual estimate of the coefficient of variation ( |

`mean` |
observed mean |

`sd` |
observed standard deviation (based on |

`N` |
sample size |

`unbiased` |
return the unbiased estimate of the coefficient of variation |

A function to calculate the usual estimate of the coefficient of variation or its unbiased estimate.

Returns the estimated coefficient of variation (regular but biased estimate or unbiased estimate.

Ken Kelley (University of Notre Dame; KKelley@ND.Edu)

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