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Table 2 Regression equations to estimate solar radiation from sunshine duration for Bangladesh

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

# Annual models Equations R 2
1 Linear \(H/H_0=0.4256 (S/S_0)+ 0.2199\) 0.8888
2 Quad. \(H/H_0=0.749(S/S_0)^2- 0.3752(S/S_0)+ 0.417\) 0.8920
3 Cubic \(H/H_0=3.1987(S/S_0)^3- 4.4223(S/S_0)^2+2.3158(S/S_0)- 0.0306\) 0.8899
4 Expo. \(H/H_0=0.2673\exp [0.9422(S/S_0)]\) 0.8913
5 Log. \(H/H_0=0.2152\ln (S/S_0) +0.5916\) 0.8729
6 Power \(H/H_0 = 0.6093(S/S_0)^{0.478}\) 0.8804