Reference

Equation Form

Original country of application

RMSE (Mj·mm/(ha·hr))

MAPE (%)

MAE (Mj·mm/(ha·hr))

Bols (1978)

$R=\frac{2.5\ast p^2}{100\ast \left(0.073\ast p+0.73\right)}$

Indonesia

842.12

93.05

640.57

Roose (1976)

$R=17.02\ast \left(0.5\pm 0.05\right)\ast p$

West Africa

556.88

100.16

417.2

Mikhailova et al. (1997)

$R=-3172+7.562\ast p$

Honduras

2920

883

2900

Torri et al. (2006)

$R=-944+3.08\ast p$

Italy

1286.4

313.8

1236.8

Jung et al. (1983)

$R=9.08\ast 0.0115\ast p^{1.4947}$

Korea

661.97

75.85

511.01

Renard & Freimund (1994)

$R=0.0483\ast p^{1.61}$

United States

689.35

80.5

536.29

Eltaif et al. (2010)

$R=23.61\ast {\text{e}}^{0.0048\ast p}$

Jordan

837.6

89.2

632.1

Recalibrated equation

$R=5.4228\ast P$

280.83

47.6

213.06