Table 4: Validation of the two variable correlation radio refractivity model for osogbo under different statistical tests.

Models R2 MBE RMSE MPE NSE IA
Eqn.17a 26.1 5.5419 11.9694 -1.6342 99.8787 99.9701
Eqn.17b 98.6 0.3196 1.4904 -0.0905 99.9981 99.9995
Eqn.17c 57.1 -2.8103 8.5564 0.7300 99.938 99.9844
Eqn.17d 100.0 0.4177 0.4988 -0.1162 99.9998 99.9999
Eqn.17e 27.9 -7.3584 12.8025 1.9618 99.8612 99.9645
Eqn.17f 98.8 0.1343 1.3719 -0.0385 99.9984 99.9996