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Table 5 Correlation coefficients of quadratic model for sunshine duration estimation from cloud fraction and statistical error tests of different stations of Zone 1

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

Stations Model a b c R 2 MPE MBE MARE RMSE t-stat
Teknaf Regional 0.5364 0.269 0.1461 0.9848 1.7305 −0.0541 0.0498 0.2808 0.6511
Zone 1 0.4284 0.2462 0.2144 0.9309 −0.8473 0.2748 0.0902 0.5985 1.714
Countrywide 0.4548 0.1851 0.2385 0.9038 −0.8258 0.3196 0.1057 0.7064 1.6829
Cox’s Bazar Regional 0.5329 0.2004 0.1405 0.9699 1.7093 −0.066 0.0506 0.3511 0.6356
Zone 1 0.4284 0.2462 0.2144 0.8405 −9.3925 0.707 0.1024 0.8083 5.9863
Countrywide 0.4548 0.1851 0.2385 0.8157 −9.4079 0.7441 0.1083 0.8688 5.5043
Kutubdia Regional 0.4492 0.2499 0.1766 0.9644 1.4224 −0.0627 0.0413 0.3178 0.6684
Zone 1 0.4284 0.2462 0.2144 0.9325 −3.9831 0.3033 0.0557 0.4376 3.1897
Countrywide 0.4548 0.1851 0.2385 0.9141 −4.1987 0.3461 0.0656 0.4939 3.2588
Khepupara Regional 0.6106 0.0349 0.3091 0.9505 −0.6233 0.0511 0.0467 0.3421 0.5018
Zone 1 0.4284 0.2462 0.2144 0.8192 9.3429 −0.5197 0.1019 0.654 4.341
Countrywide 0.4548 0.1851 0.2385 0.8447 9.2113 −0.4843 0.101 0.6061 4.4085
Hatiya Regional 0.4143 0.2727 0.2178 0.9498 2.7677 −0.1187 0.0486 0.3709 1.1207
Zone 1 0.4284 0.2462 0.2144 0.9255 5.342 −0.2591 0.0653 0.4519 2.3214
Countrywide 0.4548 0.1851 0.2385 0.9168 5.1502 −0.219 0.0698 0.4777 1.7109
Chittagong Regional 0.4498 0.1942 0.1918 0.9434 2.2874 −0.0931 0.0506 0.3805 0.8374
Zone 1 0.4284 0.2462 0.2144 0.8871 −5.8735 0.4022 0.0716 0.5374 3.7416
Countrywide 0.4548 0.1851 0.2385 0.8778 −5.9425 0.4325 0.0761 0.5591 4.0474
Sandwip Regional 0.4353 0.1896 0.2485 0.899 4.823 −0.2205 0.0625 0.4491 1.8692
Zone 1 0.4284 0.2462 0.2144 0.8844 6.5565 −0.3583 0.0705 0.4803 3.7146
Countrywide 0.4548 0.1851 0.2385 0.8834 6.1214 −0.3089 0.0693 0.4824 2.7645
Rangamati Regional 0.7043 −0.0151 0.267 0.9123 3.9047 −0.1673 0.0619 0.4377 1.3727
Zone 1 0.4284 0.2462 0.2144 0.8972 4.5865 −0.1984 0.0656 0.4738 1.5293
Countrywide 0.4548 0.1851 0.2385 0.883 4.5021 −0.1718 0.0716 0.5056 1.1982
Barisal Regional 0.7141 −0.027 0.2435 0.9698 2.3692 −0.0989 0.044 0.2998 1.1589
Zone 1 0.4284 0.2462 0.2144 0.9454 −0.8815 0.1138 0.0506 0.4031 0.9764
Countrywide 0.4548 0.1851 0.2385 0.9391 −0.8889 0.1434 0.0543 0.4258 1.1867
Maijdee Court Regional 0.7043 −0.0151 0.2670 0.8936 6.4040 −0.3615 0.0783 0.4995 3.4782
Zone 1 0.4284 0.2462 0.2144 0.8415 8.4215 −0.4696 0.0925 0.6098 4.0045
Countrywide 0.4548 0.1851 0.2385 0.8626 8.1031 −0.4228 0.0871 0.5678 3.6997
Jessore Regional 0.4642 0.1610 0.2657 0.9292 2.6934 −0.1368 0.0480 0.3677 1.3294
Zone 1 0.4284 0.2462 0.2144 0.8339 6.6521 −0.4023 0.0730 0.5633 3.3839
Countrywide 0.4548 0.1851 0.2385 0.8684 6.3433 −0.3619 0.0709 0.5014 3.4590
Khulna Regional 0.7043 −0.0151 0.2670 0.9109 5.9973 −0.2692 0.0712 0.4829 2.2271
Zone 1 0.4284 0.2462 0.2144 0.8764 7.1841 −0.3415 0.0859 0.5687 2.4906
Countrywide 0.4548 0.1851 0.2385 0.8722 6.7666 −0.2903 0.0857 0.5783 1.9253