pastas.stats.signatures.reversals_avg
=====================================

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

   
   Average annual number of rises and falls in daily head.

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

   :returns: Average number of rises and falls in daily head per year.
   :rtype: float

   .. rubric:: Notes

   Average annual number of rises and falls (i.e., change of sign) in daily head
   :cite:p:`richter_method_1996`. The higher the number of reversals, the more
   variable the head is, and vice versa. If the head data is not daily, a warning is
   issued and nan is returned.















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