pastas.stats.signatures.date_min
================================

.. py:function:: pastas.stats.signatures.date_min(series: pandas.Series) -> float

   
   Compute the average date of the minimum head value with circular statistics.

   :param series: Pandas Series with DatetimeIndex and head values.
   :type series: pandas.Series

   :returns: Average date of the minimum head value.
   :rtype: float

   .. rubric:: Notes

   Average date of the minimum head value. The higher the date, the later the minimum
   head value occurs in the year, and vice versa.

   The average date is computed by taking the average of the day of the year of the
   minimum head value for each year, using circular statistics. We refer to
   :cite:t:`fisher_statistical_1995` (page 31) for more information on circular
   statistics.















   ..
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