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Ecological Processes

Table 1 Importance of various environmental parameters on the distribution of P. americana

From: Ecological niche shifts affect the potential invasive risk of Phytolacca americana (Phytolaccaceae) in China

Environmental variables

PC

PI (%)

TRGw

TRGo

TGw

TGo

AUCw

AUCo

Bio6

51.41

34.02

1.3525

1.1673

1.2950

1.1516

0.8960

0.8683

Bio2

27.91

16.78

1.3648

1.1694

1.3109

1.1424

0.8983

0.8724

Bio17

4.91

11.60

1.3629

1.1001

1.3255

1.0680

0.8978

0.8668

Bio12

4.29

6.17

1.3728

1.1097

1.3214

1.0936

0.8988

0.8659

Bio18

3.23

7.69

1.3671

1.0037

1.3175

0.9954

0.8976

0.8576

Bio5

2.98

10.78

1.3585

0.5011

1.2938

0.5055

0.8946

0.7675

Bio3

2.32

3.59

1.3737

0.2055

1.3242

0.2078

0.8989

0.6672

Bio15

2.02

6.76

1.3710

0.6277

1.3144

0.6127

0.8980

0.7951

Bio8

0.93

2.61

1.3731

0.4272

1.3169

0.4279

0.8974

0.7350

  1. PC is percent contribution; PI is permutation importance; TRGO is the regularization training gain using the factor alone; TRGW is the regularization training gain using other factors; TGO is the test gain using the factor alone; TGw is the test gain using other factors; AUCw is the area under the receiver operating characteristic curve using other factors; AUCo is the area under the working characteristic curve of the subjects using the variable alone
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