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This paper measures the predictive efficiencies of four empirical models developed for estimating global solar radiation in Bida (9.1°N, 6.02°E). A set of constants for Angstrom-type correlation of the linear, quadratic, cubic, and power form, were determined from sunshine-hours data measured over the period (2000 - 2012). The predictive efficiencies of the models were also compared with the actual efficiency. The results show that the models have equal efficiencies and therefore can be used separately, for calculating solar radiation in Bida.

Testing the Predictive Efficiencies of Four Angstrom-Type Models for estimating Solar Radiation in Bida Nigeria