In: Math
| Week | 1 | 2 | 3 | 4 | 5 | 6 |
| Value | 18 | 14 | 17 | 12 | 18 | 15 |
Calculate the measures of forecast error using the naive (most recent value) method and the average of historical data (to 2 decimals).
| Naive method | Historical data | |
| Mean absolute error | ||
| Mean squared error | ||
| Mean absolute percentage error |