The function calculates the sMAPE error between actual and predicted values.
A vector or univariate time series containing actual values for a time series that are to be compared against its respective predictions.
A vector or univariate time series containing time series predictions that are to be compared against the values in
A numeric value of the sMAPE error of prediction.
Rebecca Pontes Salles
Z. Chen and Y. Yang, 2004, Assessing forecast accuracy measures, Preprint Series, n. 2004-2010, p. 2004-10.
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