This function computes MAPE given prediction result versus evaluation set.
Usage
mape(x, y, ...)
# S3 method for class 'predbvhar'
mape(x, y, ...)
# S3 method for class 'bvharcv'
mape(x, y, ...)
Arguments
- x
Forecasting object
- y
Test data to be compared. should be the same format with the train data.
- ...
not used
Value
MAPE vector corresponding to each variable.
Details
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).
$$MAPE = mean(\lvert p_t \rvert)$$
References
Hyndman, R. J., & Koehler, A. B. (2006). Another look at measures of forecast accuracy. International Journal of Forecasting, 22(4), 679-688.
