The Actual Value of the Time Series at Time T $\frac { \sum _ { t = 1 } ^ { n } \left| \frac { A _ { t } + F _ { t } } { 2 } \right| } { n }$

Multiple Choice

The actual value of the time series at time t and the forecast value for time t is denoted by At and Ft respectively.What is the formula used for calculating the mean absolute percentage error over a range of forecasted values?

A) MAPE = $\frac { \sum _ { t = 1 } ^ { n } \left| \frac { A _ { t } + F _ { t } } { 2 } \right| } { n }$

B) MAPE = $\sqrt { \frac { \sum _ { t = 1 } ^ { n } \left| \frac { A _ { t } + F _ { t } } { 2 } \right| } { n } }$

C) MAPE = $\frac { \sum _ { t = 1 } ^ { n } \left| A _ { t } - F _ { t } \right| } { n }$

D) MAPE = $\frac { \sum _ { t = 1 } ^ { n } \left| \frac { A _ { t } + F _ { t } } { A _ { t } } \right| } { n }$ × 100