pastas.stats.signatures.colwell_constancy
=========================================

.. py:function:: pastas.stats.signatures.colwell_constancy(series: pandas.Series, bins: int = 11, freq: str = 'W', method: Literal['mean'] = 'mean', normalize: bool = True) -> tuple[float, float, float]

   
   Colwells constancy index after :cite:t:`colwell_predictability_1974`.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series
   :param bins: number of bins to determine the states of the groundwater.
   :type bins: int
   :param freq: frequency to resample the series to.
   :type freq: str, optional
   :param method: Method to use for resampling. Only "mean" is allowed now.
   :type method: str, optional
   :param normalize: normalize the time series to values between zero and one.
   :type normalize: bool, optional

   :returns: **c** -- Colwell's constancy.
   :rtype: float

   .. rubric:: Notes

   One minus the sum of entropy with respect to state, divided by the logarithm of
   the absolute number of possible states.















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