Table 3 Variables importance of selected factors through applied three models.

From: Hydro-chemical based assessment of groundwater vulnerability in the Holocene multi-aquifers of Ganges delta

Factors

LR

RF

ANN

NO3

0.44

0.35

0.41

AS

0.69

0.72

0.78

PO42−

0.32

0.21

0.38

SO42−

0.2

0.22

0.19

Salinity

0.32

0.24

0.31

HCO3

0.54

0.55

0.67

CI

0.41

0.38

0.47

K+ 

0.24

0.25

0.28

Na+ 

0.77

0.84

0.88

Mg2+

0.58

0.54

0.51

F−

0.74

0.77

0.81

pH

0.21

0.28

0.24

EC

0.31

0.39

0.33

Depth

0.4

0.41

0.41

Ca2+

0.33

0.31

0.35

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