Empirical Models for Estimating Global Solar Radiation over the Ashanti Region of Ghana

Table 3

Summary of the model evaluations using sunshine hours.

Model form	𝑅	𝑅^2	MBE (MJ m^−2 day^−1)	MPE (%)	RMSE (MJ m^−2 day^−1)
Proposed	0.9538	0.9098	−0.0102	0.0585	0.0338
Turton (1987) [20]	0.9581	0.9179	2.4926	−14.3170	8.2670
Fagbenle (1990) [21]	0.9578	0.9174	1.6177	−9.2919	5.3654
Otu-Danquah (1990) [22]	0.9561	0.9142	2.1885	−12.5706	7.2586
Jackson and Akuffo (1992) [23]	0.9553	0.9125	1.4688	−8.4365	4.8715
Augustine and Nnabuchi (2009b) [18]	0.9575	0.9168	2.4430	−14.0319	8.1024