![]() ![]() Provided the data are strictly positive, a better measure of relative accuracy can be obtained based on the log of the accuracy ratio: log( F t / A t) (200% for the first formula and 100% for the second formula). SMAPE = 100 % n ∑ t = 1 n | F t − A t | ( | A t | + | F t | ) / 2 Ī limitation to SMAPE is that if the actual value or forecast value is 0, the value of error will boom up to the upper-limit of error. ![]() Symmetric mean absolute percentage error (SMAPE or sMAPE) is an accuracy measure based on percentage (or relative) errors.
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