pastas.stats.dutch.q_ghg
========================

.. py:function:: pastas.stats.dutch.q_ghg(series: pandas.Series, tmin: pandas.Timestamp | str | None = None, tmax: pandas.Timestamp | str | None = None, q: float = 0.94, by_year: bool = True) -> pandas.Series

   
   Quantiles for the Gemiddeld Hoogste Grondwaterstand.

   GHG is also called MHGL (Mean High Groundwater Level).

   :param series: Series to calculate the GHG for.
   :type series: pandas.Series
   :param tmin: A string or pandas.Timestamp with the start and end dates for the
                period (E.g. '1980-01-01 00:00:00' and '2020-01-01 00:00:00').
                If None, the entire series is used.
   :type tmin: pandas.Timestamp or str, optional
   :param tmax: A string or pandas.Timestamp with the start and end dates for the
                period (E.g. '1980-01-01 00:00:00' and '2020-01-01 00:00:00').
                If None, the entire series is used.
   :type tmax: pandas.Timestamp or str, optional
   :param q: quantile fraction of exceedance (default 0.94)
   :type q: float, optional
   :param by_year: Take average over quantiles per year (default True)
   :type by_year: bool, optional

   .. rubric:: Notes

   Approximated by taking quantiles of the time series values per year and
   calculating the mean of the quantiles. The series is first resampled to daily
   values.















   ..
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