Forecasting Different Types of Droughts Simultaneously Using Multivariate Standardized Precipitation Index (MSPI), MLP Neural Network, and Imperialistic Competitive Algorithm (ICA)

Table 5

The models’ likelihood in determining MSPI drought classes.

Time window	Likelihood percentage of the drought severity classes (%)
	Hamedan		Kermanshah
	MLP	MLP-ICA	MLP	MLP-ICA
MSPI3–6	69.90	73.79	65.05	68.93
MSPI6–12	68.32	77.23	70.30	75.25
MSPI3–12	72.28	75.25	67.33	69.31
MSPI12–24	80.00	90.00	86.67	88.89
MSPI24–48	79.52	86.75	95.78	96.39