Fig 1.
Structure of the hybrid SVR and IPSO.
Fig 2.
Genetic porgramming structure and search process.
Fig 3.
a) Location of the studied stations b: Temperature Average c: Sun hours Average, d: Rainfall average and e: Humidity average.
Table 1.
Monthly statistical parameters of each climatological data set.
Table 2.
Comparison of statistical indices for different methods for estimation of solar radiation in Antakya station.
Fig 4.
Computed RMSE for Antakya station.
Fig 5.
Observed and estimated SR of Antakya station at the test stage.
(A) SVR-IPSO (4), (B) SVR- IPSO (3), (C) SVR-I PSO (2) and (D) SVR-IPSO (1).
Table 3.
Comparison of statistical indices for different models for estimation of solar radiation in the test stage for Adana station.
Fig 6.
Computed RMSE for Adana station.
Fig 7.
Observed and estimated SR of Adana station at the test stage.
(A) SVR-IPSO (4), (B) SVR- IPSO (3), (C) SVR- IPSO (2) and (D) SVR- IPSO (1).
Table 4.
Comparison of statistical indices for different methods for estimation of solar radiation at the test stage based on periodic models for Antakya station.
Fig 8.
Observed and estimated SR of Antakya station at test stage based on the periodic model.
(A) SVR-IPSO (4), (B) SVR- IPSO (3), (C) SVR- IPSO (2) and (D) SVR- IPSO (1).
Table 5.
Comparison of statistical indices for different models for estimation of solar radiation at the test stage based on periodic models for Adana station.
Table 6.
Comparison of statistical indices for different methods for estimation of daily solar radiation in Konay station.
Fig 9.
Observed and estimated SR of Adana station based on periodic predication at the test stage.
(A) SVR-IPSO (4), (B) SVR- IPSO (3), (C) SVR- IPSO (2) and (D) SVR- IPSO (1).
Table 7.
The enhancement rate for best model (SVR-IPSO (4)) comparing with the previous study [3].