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Table 4 Different models to estimate sunshine duration from cloud fraction of Bangladesh and their equations with coefficient of determination

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

Model type Model equations Goodness of fit (R 2)
Linear \((1-S/S_0) = 0.6034C + 0.1739\) 0.7402
Qudratic \((1-S/S_0) = 0.4548C^2 + 0.1851C + 0.2385\) 0.7578
Third degree \((1-S/S_0) = -0.0855C^3 + 0.5721C^2 + 0.1409C + 0.2424\) 0.7578
Fourth degree \((1-S/S_0) = -2.6566C^4 + 4.8588C^3 - 2.4378C^2 +0.7996C + 0.2039\) 0.7597
Fifth degree \((1-S/S_0) = 0.273C^5 - 3.2931C^4 + 5.3912C^3 -2.6292C^2 + 0.8272C + 0.2028\) 0.7597