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In the multiple imputation method, the best results were obtained for data at five stations. In estimating the missing values of precipitation at Bandar Lengeh, the M5 decision-tree model was selected. The best results were obtained when the data related to monthly precipitation at the stations of Bandar Abbas, Jask, Abomoosa and Kish Islands was used. The M5 model in the form of three decision rules (involving linear Equations (12)–(14)) estimates the monthly precipitation at the Bandar Lengeh station with relatively acceptable accuracy. These rules are provided in Table 4.

Table 4

The rules produced by the M5 model tree for monthly precipitation estimation

Rule no.IfThenEquation no.
and   (12) 
  (13) 
otherwise  (14) 
Rule no.IfThenEquation no.
and   (12) 
  (13) 
otherwise  (14) 

Note: *B represents Bandar in all equations.

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