This function computes MAPE given prediction result versus evaluation set.
mape(x, y, ...)# S3 method for predbvhar
mape(x, y, ...)
# S3 method for bvharcv
mape(x, y, ...)
MAPE vector corresponding to each variable.
Forecasting object
Test data to be compared. should be the same format with the train data.
not used
Let \(e_t = y_t - \hat{y}_t\). Percentage error is defined by \(p_t = 100 e_t / Y_t\) (100 can be omitted since comparison is the focus).
$$MAPE = mean(\lvert p_t \rvert)$$
Hyndman, R. J., & Koehler, A. B. (2006). Another look at measures of forecast accuracy. International Journal of Forecasting, 22(4), 679-688.