pastas.stats.signatures.duration_curve_slope
============================================

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

   
   Slope of the head duration curve between percentile l and u after
   :cite:t:`oudin_are_2010`.

   :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, optional
   :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: Slope of the head duration curve between percentile l and u.
   :rtype: float

   .. rubric:: Notes

   Slope of the head duration curve between percentile l and u. The more negative the
   slope, the more values are above or below the percentile l and u, and vice versa.

   Note that the slope is negative, contrary to the flow duration curve commonly used
   in surface water hydrology.















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