pastas.stats.metrics.me
=======================

.. py:function:: pastas.stats.metrics.me(obs: pandas.Series | None = None, sim: pandas.Series | None = None, res: pandas.Series | None = None, missing: str = 'drop', weighted: bool = False, max_gap: int = 30) -> float

   
   Compute the (weighted) Mean Error (ME).

   :param sim: Series with the simulated values.
   :type sim: pandas.Series, optional
   :param obs: The Series with the observed values.
   :type obs: pandas.Series, optional
   :param res: The Series with the residual values. If time series for the residuals are
               provided, the sim and obs arguments are ignored. Note that the residuals
               must be computed as `obs - sim` here.
   :type res: pandas.Series, optional
   :param missing: string with the rule to deal with missing values. Only "drop" is supported now.
   :type missing: str, optional
   :param weighted: Weight the values by the normalized time step to account for irregular time
                    series. Default is False.
   :type weighted: bool, optional
   :param max_gap: maximum allowed gap period in days to use for the computation of the weights.
                   All time steps larger than max_gap are replace with the max_gap value.
                   Default value is 30 days.
   :type max_gap: int, optional

   .. rubric:: Notes

   The Mean Error (ME) between the observed (:math:`y_o`) and simulated
   (:math:`y_s`) time series is computed as follows:

   .. math:: \text{ME} = \sum_{i=1}^{N} w_i (y_o - y_s)

   where :math:`N` is the number of observations in the observed time series.















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