pastas.stats.signatures.low_pulse_count
=======================================

.. py:function:: pastas.stats.signatures.low_pulse_count(series: pandas.Series, quantile: float = 0.2, rolling_window: str | None = '7D') -> float

   
   Average number of times the series is below a certain threshold per year.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series
   :param quantile: Quantile used as a threshold.
   :type quantile: float, optional
   :param rolling_window: Rolling window to use for smoothing the time series. Default is 7 days. Set to
                          None to disable. See the pandas documentation for more information.
   :type rolling_window: str, optional

   :returns: Average number of times the series exceeds a certain threshold per year.
   :rtype: float

   .. rubric:: Notes

   Number of times during which the head drops below a certain threshold.
   The threshold is defined as the 20th percentile of non-exceedance
   :cite:t:`richter_method_1996`.

   .. warning::

      This method is sensitive to measurement noise, e.g., every change is sign in the
      differences is counted as a pulse. Therefore, it is recommended to smooth the time
      series first (which is also the default).















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