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Transdisciplinarity Enabled

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