Table 4 Statistical indices for estimating X1 and X2 values.

From: Using machine learning methods for supporting GR2M model in runoff estimation in an ungauged basin

Statistical indices

X1

X2

MLR

RF

M5

SPA

PSA

MLR

RF

M5

SPA

PSA

MAE

1.45

0.58

1.50

1.67

1.95

0.05

0.03

0.05

0.08

0.10

RMSE

1.80

0.77

1.92

2.41

2.46

0.07

0.04

0.07

0.12

0.14

r

0.68

0.97

0.62

0.39

0.30

0.79

0.98

0.83

0.27

 − 0.16

CA

1.26

0.47

1.34

1.64

1.77

0.16

0.03

0.14

0.37

0.41

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