pastas.stats.signatures.avg_seasonal_fluctuation
================================================

.. py:function:: pastas.stats.signatures.avg_seasonal_fluctuation(series: pandas.Series, normalize: bool = False) -> float

   
   Average seasonal fluctuation after :cite:t:`martens_groundwater_2013`.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series
   :param normalize: normalize the time series to values between zero and one.
   :type normalize: bool, optional

   :returns: Average seasonal fluctuation (s).
   :rtype: float

   .. rubric:: Notes

   Mean annual difference between the averaged 3 highest monthly heads
   per year and the averaged 3 lowest monthly heads per year.

   Average seasonal fluctuation (s):

       s = MHW - MLW

   A higher value of s indicates a more seasonal head, and vice versa.

   .. warning::

      In this formulating the water table is referenced to a certain datum and
      positive, not as depth below the surface!















   ..
       !! processed by numpydoc !!