Forecasting Daily and Monthly Reference Evapotranspiration in the Aidoghmoush Basin Using Multilayer Perceptron Coupled with Water Wave Optimization

Table 2

The daily scale of outputs in the PCA.

	Input	PC (1)	PC (2)	PC (3)	PC (1)	PC (5)	PC (6)	PC (7)
Daily scale	E (d − 1)	0.94	0.93	0.92	0.62	0.55	0.43	0.42
	E (d − 2)	0.90	0.92	0.91	0.59	0.54	0.47	0.42
	E (d − 3)	0.89	0.91	0.90	0.55	0.52	0.40	0.39
	E (d − 4)	0.65	0.62	0.69	0.49	0.58	0.47	0.42
	E (d − 5)	0.62	0.45	0.42	0.42	0.45	0.40	0.39
	E (d − 6)	0.54	0.34	0.31	0.29	0.41	0.36	0.35
	E (d − 7)	0.43	0.29	0.27	0.25	0.32	0.30	0.29
	Explained variance %	54	22	17	3	3	0.5	0.5
	Eigen value	3.24	1.32	1.02	0.18	0.18	0.03	0.03
	Cumulative variance %	54	76	91	96	99	100	100
Monthly scale	E (m − 1)	0.95	0.94	0.92	0.76	0.61	0.60
	E (m − 2)	0.94	0.92	0.91	0.69	0.55	0.52
	E (m − 3)	0.93	0.92	0.90	0.67	0.44	0.41
	E (m − 4)	0.85	0.84	0.80	0.65	0.42	0.39
	E (m − 5)	0.82	0.81	0.79	0.62	0.40	0.34
	E (m − 6)	0.80	0.79	0.77	0.55	0.38	0.36
	Explained variance (%)	53	27	17	2	0.5	0.5
	Eigen vale	3.18	1.62	1.02	0.12	0.03	0.03
	Cumulative variance %	53	80	94	99	99.5	100