In the second case (8-interval forecast), the MLP estimates 8 values of future load, the first of them corresponding to the 15- minute ahead forecast. This value is directly comparable to the forecast produced in the first case (1-interval forecast), and the resulting AVG Error, MAX Error and SD for this interval are 2.2%, 12.3% and 1.5%, respectively. This values are greater than those of the first case, as expected, because in the second case the MLP possesses a greater number of weights and outputs.
AVG Error, MAX Error and SD for the 8th interval are 5.0%, 14.3% and 2.7% respectively. Again, larger errors for the 8th interval in comparison to the 1st interval were expected because the more distant in future time the forecast, the less influence of current and past demand values.