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Deterministic MME

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Biased ensemble mean

The simple ensemble method with biased data is given by
where, is the biased ensemble mean, N number of models, is the ith model forecast out of N models.

Bias-corrected ensemble mean

The simple ensemble method with bias-corrected data is defined as
is the bias-corrected ensemble mean, is the mean of i-th forecast over the training period, is the observed mean over the training period. The systematic errors for forecast models can be removed due to anomaly term, (), which accounts model's own seasonal climatology.
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