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Decision rule (1) above states that if the amount of monthly precipitation at Bandar Abbas is equal or less than 3.55 mm and the monthly precipitation at Kish Island is equal or less than 0.15 mm, then monthly precipitation in Bandar Lengeh is calculated from Equation (12). Rule 2 states that if the monthly precipitation at Kish Island is equal to or less than 24.7, then the monthly precipitation at Bandar Lengeh is calculated using Equation (13). According to rule 3, in other situations, the amount of monthly precipitation at Bandar Lengeh is computed using Equation (14). The results obtained from various classic statistical methods and the M5 decision tree model are presented in Table 5.

Table 5

Performance criteria values for different methods of estimating missing monthly rainfall data

Method		R	N-S	RMSE (mm)	MAE (mm)	Mean (mm)	Variance (mm)
	Test phase	–	–	–	–	5.682	14.838
Classical statistical methods	AA	0.95	0.86	5.65	2.78	7.136	17.135
	MLR	0.93	0.87	5.49	2.61	5.897	13.026
	NIPALS	0.94	0.86	5.61	3.25	7.149	15.602
	NR	0.90	0.73	7.992	3.82	8.32	17.091
	IDWM	0.90	0.75	7.70	3.85	8.065	16.792
	MI	0.83	0.53	10.56	8.41	12.508	13.3
	LR	0.65	0.46	11.22	50.00	4.985	8.142
	UK	0.65	0.47	11.16	4.97	4.525	8.846
	SIB	0.65	0.47	11.19	4.60	5.553	10.855
Data mining method	M5	0.95	0.89	5.01	2.48	4.621	12.293

Method		R	N-S	RMSE (mm)	MAE (mm)	Mean (mm)	Variance (mm)
	Test phase	–	–	–	–	5.682	14.838
Classical statistical methods	AA	0.95	0.86	5.65	2.78	7.136	17.135
	MLR	0.93	0.87	5.49	2.61	5.897	13.026
	NIPALS	0.94	0.86	5.61	3.25	7.149	15.602
	NR	0.90	0.73	7.992	3.82	8.32	17.091
	IDWM	0.90	0.75	7.70	3.85	8.065	16.792
	MI	0.83	0.53	10.56	8.41	12.508	13.3
	LR	0.65	0.46	11.22	50.00	4.985	8.142
	UK	0.65	0.47	11.16	4.97	4.525	8.846
	SIB	0.65	0.47	11.19	4.60	5.553	10.855
Data mining method	M5	0.95	0.89	5.01	2.48	4.621	12.293

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