Classify changes over time

Calculate Kvalseth's COV.

1 | ```
Kvalseth(V)
``` |

`V` |
A frequency vector |

This function calculates Kvalseth's COV, a measure of dispersion based on linear Euclidean distances. It is based on th IOV measure, implemented as `BerryMielke`

. This function follows the presentation by Blair and Lacy 2000.

The function returns the COV.

Didier Ruedin

Blair, J., and M. Lacy. 2000. Statistics of Ordinal Variation. Sociological Methods \& Research 28 (3): 251-280.

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