Skip to main content

Advertisement

Table 6 Cloud cover-based models and their error estimations

From: Global solar radiation estimation from commonly available meteorological data for Bangladesh

Model no. Model type Equations \(R^2\) MBE MPE MARE RMSE t stat
22 Linear \(H/H_0 = -0.2302C + 0.5713\) 0.993695408 0.021340195 0.656623 0.071691 0.33156 0.213912
23 Quadratic \(H/H_0 = -0.4585C^2 + 0.2087C + 0.4942\) 0.995392681 0.015789962 0.490597 0.058503 0.283438 0.185052
24 Third degree \(H/H_0 = 1.9104C^3 - 3.1785C^2 + 1.3352C + 0.3669\) 0.99540268 0.01358356 0.448265 0.048137 0.28313 0.159303
25 Fourth degree \(H/H_0 = -11.449C^4 + 23.22C^3 - 16.729C^2 + 4.7227C + 0.0963\) 0.995752521 0.000808352 0.800828 0.054337 0.272144 0.009851
26 Fifth degree \(H/H_0 = 120.19C^5 - 299.15C^4 + 281.59C^3 - 124.07C^2 + 25.073C - 1.3032\) 0.997452146 0.015181073 0.113112 0.034455 0.210776 0.239501
27 Logarithmic \(H/H_0 = -0.083\hbox {ln}(C) + 0.386\) 0.990582324 0.016444457 0.887773 0.090946 0.405233 0.1347
28 Exponential \(H/H_0 = 0.5819\hbox {exp}(-0.509C)\) 0.993189811 0.036221558 0.347545 0.072874 0.344598 0.350561
29 Power \(H/H_0 = 0.3862C^{-0.184}\) 0.989958374 0.037624897 0.44366 0.091626 0.418442 0.299433