Table 5 Characterization of MARS model within forward and backward passes.

From: Enhancement of groundwater resources quality prediction by machine learning models on the basis of an improved DRASTIC method

k-fold

Number of effective parameters

Number of BFs in final model

Time performance

1

43.5

18

0.65

2

38.5

16

0.69

3

28.5

12

0.61

4

38.5

16

0.63

5

43.5

18

0.66

6

46

19

0.85

7

46

19

0.52

8

43.5

18

0.56

9

28.5

12

0.31

10

41

17

0.37

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