pastas.stats.signatures.duration_curve_ratio
============================================

.. py:function:: pastas.stats.signatures.duration_curve_ratio(series: pandas.Series, l: float = 0.1, u: float = 0.9, normalize: bool = True) -> float

   
   Ratio of the head duration curve between the percentile l and u after
   :cite:t:`richards_measures_1990`.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series
   :param l: lower percentile, a float between 0 and 1, lower than u.
   :type l: float
   :param u: upper percentile, a float between 0 and 1, higher than l.
   :type u: float, optional
   :param normalize: normalize the time series to values between zero and one.
   :type normalize: bool, optional

   :returns: Ratio of the duration curve between the percentile l and u.
   :rtype: float

   .. rubric:: Notes

   Ratio of the duration curve between the percentile l and u. The higher the ratio,
   the flatter the head duration curve, and vice versa.















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