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Table 3 Statistical summary of Monthly climatology of ETo values (mm/day) calculated by six empirically based methods during 1967 - 1982

From: A comparative analysis of reference evapotranspiration from the surface of rainfed grass in Yaounde, calculated by six empirical methods against the penman-monteith formula

  Turc’s [23] (a) Stephens and Stewart [22], modified by Jensen and Haise [11] (a) Blaney and Criddle [6] (a) Blaney and Criddle modified by Shih et al., [21] (a) Papadakis [15] (a) P.M modified by Frere and Popov [9] (a)
a (Slope) 3.25 5 1.39 1 0.39 2 2.68 4 0.14 3 4.02 6
b (Intercept) -2.36 4 -1.62 3 3.97 6 -3.25 5 -0.17 2 0.04 1
R2 0.951 2 0.960 1 0.357 6 0.928 3 0.859 5 0.916 4
RMSE 0.080 2 0.072 1 0.289 6 0.097 3 0.135 4 0.105 5
RMSEs 0.975 5 0.980 6 0.598 1 0.963 3 0.927 2 0.957 4
RMSEu 0.293 4 0.693 1 0.919 3 0.340 2 6.006 5 0.228 6
MBE 14.63 4 -1.260 1 9.321 3 3.872 2 -21.95 5 31.21 6
Rank 4   1   5   2   3   6  
  1. (a) Daily estimate rank number for each statistical index