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mef: forrecast bias, mean of the errors between forecast and the verifying reference:

Mathdisplay
\text{mef}=\overline{F-A}

sdef: standard deviation of the forecast error:

Mathdisplay
\text{sdef}=\sqrt{\overline{\left[(F-A)-\overline{F-A}\right]^2}}

rmsef: square root of the mean square error of the forecast:

Mathdisplay
\text{rmsef}=\sqrt{\overline{(F-A)^2}}




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