pastas.stats.signatures.reversals_cv
====================================

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

   
   Coefficient of Variation in annual number of rises and falls.

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

   :returns: Coefficient of Variation in annual number of rises and falls.
   :rtype: float

   .. rubric:: Notes

   Coefficient of Variation in annual number of rises and falls in daily head
   :cite:p:`richter_method_1996`. If the coefficient of variation is high, the number
   of reversals is highly variable, and vice versa. If the head data is not daily, a
   warning is issued and nan is returned.















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