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Table 2 Relative average improvement.

From: Regression tree construction by bootstrap: Model search for DRG-systems applied to Austrian health-data

Tree Size

HDG0106

HDG0202

HDG0304

HDG0502

MEL0101

MEL0203

MEL0401

MEL0501

Average

2

0.00

1.12

2.55

0.71

1.20

3.74

3.34

-1.52

1.39

3

0.00

2.78

3.33

1.65

5.96

1.88

3.92

-1.97

2.19

4

-0.36

5.57

3.52

1.23

5.77

3.30

4.28

-1.05

2.78

5

0.42

3.18

3.85

2.30

7.43

0.26

3.81

-0.84

2.55

6

-0.24

4.38

5.47

1.13

9.65

12.03

2.33

4.41

4.90

8

-0.11

6.05

1.75

1.15

1.06

12.91

2.67

3.63

3.64

10

-0.06

3.99

3.16

0.69

-2.93

5.09

1.94

2.83

1.84

12

-0.42

4.14

3.24

1.75

2.89

1.61

1.24

4.95

2.43

14

-1.87

3.35

1.82

1.20

-0.36

0.00

2.15

2.17

1.06

16

-0.76

2.11

2.52

1.27

1.38

1.18

1.89

0.65

1.28

  1. Relative average improvement of the best bootstrapped tree compared to the standard CART tree using 10-fold cross validation.