pastas.stats.signatures.cv_date_min
===================================

.. py:function:: pastas.stats.signatures.cv_date_min(series: pandas.Series) -> float

   
   Coefficient of variation of the date of annual minimum head.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series

   :returns: **cv** -- Coefficient of variation of the date of annual minimum head.
   :rtype: float

   .. rubric:: Notes

   Coefficient of variation of the date of annual minimum head computed using circular
   statistics as described in :cite:t:`fisher_statistical_1995` (page 32). If there
   are multiple dates with the same minimum head, the first date is chosen. The higher
   the coefficient of variation, the more variable the date of the annual minimum head
   is, and vice versa.















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