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Table 3 The regressions equations and coefficient of determination (R2) for each location

From: Monthly-averaged hourly solar diffuse radiation models for world-wide locations

Country Location Regression equations R2
India Chennai y = 0.5124x2-0.9809x + 0.8733 0.83
Pune y = 0.4083x2-0.873x + 0.853 0.92
Kingdom of Bahrain Bahrain y = 1.4455x2-2.113x + 1.1262 0.98
State of Kuwait Kuwait y = 0.7088x2-1.3237x + 0.8299 0.96
Spain Almeria y = 1.9414x2-2.9329x + 1.3637 0.98
Portugal Faro y = 0.9184x2-2.2173x + 1.3654 0.99
Lisbon y = 0.0721x2-1.3001x + 1.1246 0.99
Spain Madrid y = 0.9087x2-2.0465x + 1.1808 0.99
Girona y = 0.1781x2-1.0867x + 0.887 0.98
United Kingdom Camborne y = 0.8188x2-1.1127x + 0.9365 0.96
Bracknell y = 1.4394x2-1.5414x + 0.9878 0.97
Aberporth y = 0.9797x2-1.3032x + 0.9403 0.95
Finningley y = 0.451x2-0.876x + 0.9267 0.99
Stornoway y = 7441x2-1.1382x + 1.0147 0.98