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Table 6 Correlation coefficients of quadratic model for sunshine duration estimation from cloud fraction and statistical error tests of different stations of Zone 2

From: Estimation of solar radiation from cloud cover data of Bangladesh

Stations Model a b c R 2 MPE MBE MARE RMSE t-stat
Faridpur Regional 0.4923 0.1793 0.2518 0.9355 −1.5308 0.0807 0.0412 0.3255 0.8489
Zone 2 0.5102 0.0911 0.2703 0.9514 2.1836 −0.1116 0.0375 0.2826 1.4264
Countrywide 0.4548 0.1851 0.2385 0.9359 2.6308 −0.1623 0.0384 0.3247 1.9139
Dhaka Regional 0.7772 −0.1561 0.2823 0.9585 0.1666 0.0000 0.0368 0.2820 0.0000
Zone 2 0.5102 0.0911 0.2703 0.8751 −5.0073 0.3470 0.0612 0.4894 3.3349
Countrywide 0.4548 0.1851 0.2385 0.8672 −4.8924 0.3180 0.0637 0.5046 2.6918
Ishurdi Regional 0.6081 0.0356 0.2713 0.9126 0.3645 −0.0338 0.0401 0.3831 0.2940
Zone 2 0.5102 0.0911 0.2703 0.9190 1.0880 −0.0549 0.0433 0.3688 0.4994
Countrywide 0.4548 0.1851 0.2385 0.8837 1.5396 −0.1044 0.0476 0.4420 0.8062
Tangail Regional 0.5286 0.0904 0.3090 0.9152 1.4147 −0.0402 0.0538 0.3871 0.3470
Zone 2 0.5102 0.0911 0.2703 0.7352 10.5005 −0.5564 0.1053 0.6845 4.6278
Countrywide 0.4548 0.1851 0.2385 0.7047 10.9350 −0.6054 0.1093 0.7227 5.0868
Srimangal Regional 0.6081 0.0356 0.2713 0.7843 8.3236 −0.4115 0.0931 0.6273 2.8828
Zone 2 0.5102 0.0911 0.2703 0.7496 8.6157 −0.4109 0.1012 0.6759 2.5393
Countrywide 0.4548 0.1851 0.2385 0.7721 9.0217 −0.4599 0.0965 0.6447 3.3764
Rajshahi Regional 0.6081 0.0356 0.2713 0.9384 1.0918 −0.0559 0.0408 0.3268 0.5761
Zone 2 0.5102 0.0911 0.2703 0.9293 1.5105 −0.0615 0.0435 0.3501 0.5920
Countrywide 0.4548 0.1851 0.2385 0.9233 2.1406 −0.1253 0.0420 0.3646 1.2136
Mymenshingh Regional 0.4640 0.1468 0.2892 0.8973 −1.5783 0.0525 0.0577 0.3751 0.4693
Zone 2 0.5102 0.0911 0.2703 0.8450 5.1715 −0.3305 0.0530 0.4608 3.4153
Countrywide 0.4548 0.1851 0.2385 0.7744 5.4347 −0.3680 0.0577 0.5559 2.9286
Sylhet Regional 0.4726 0.1837 0.1811 0.9696 1.4943 −0.0670 0.0428 0.2979 0.7662
Zone 2 0.5102 0.0911 0.2703 0.8629 −8.6237 0.5557 0.0929 0.6327 6.0960
Countrywide 0.4548 0.1851 0.2385 0.8685 −9.0145 0.5502 0.0918 0.6195 6.4128
Bogra Regional 0.4225 0.3023 0.1872 0.9447 0.7061 −0.0651 0.0400 0.3342 0.6587
Zone 2 0.5102 0.0911 0.2703 0.9368 −0.5272 0.0957 0.0428 0.3573 0.9225
Countrywide 0.4548 0.1851 0.2385 0.9569 −0.0382 0.0379 0.0384 0.2950 0.4306
Dinajpur Regional 0.5734 0.0398 0.2962 0.8849 3.6956 −0.2112 0.0578 0.4080 2.0072
Zone 2 0.5102 0.0911 0.2703 0.7796 7.4499 −0.4435 0.0778 0.5646 4.2089
Countrywide 0.4548 0.1851 0.2385 0.7421 8.3670 −0.5273 0.0836 0.6109 5.6691
Syedpur Regional 0.6081 0.0356 0.2713 0.9194 2.5952 −0.1678 0.0448 0.3230 2.0160
Zone 2 0.5102 0.0911 0.2703 0.9168 3.0251 −0.1768 0.0462 0.3282 2.1209
Countrywide 0.4548 0.1851 0.2385 0.8961 3.5404 −0.2300 0.0509 0.3666 2.6720
Rangpur Regional 0.4192 0.1653 0.2615 0.7947 6.5107 −0.3662 0.0771 0.5369 3.0928
Zone 2 0.5102 0.0911 0.2703 0.7938 6.6344 −0.3794 0.0764 0.5380 3.2992
Countrywide 0.4548 0.1851 0.2385 0.7547 7.2168 −0.4364 0.0772 0.5868 3.6901