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Table 2 GWR models: association between mean snail density and natural characteristics in Dongting Lake region

From: Identification of optimum scopes of environmental factors for snails using spatial analysis techniques in Dongting Lake Region, China

Model Fit

R2

Adjusted R2

Log likelihood

AIC

0.74

0.65

1305.35

1446.73

Model Estimation

 

β

t

 

Min

Max

Mean

STD

Min

Max

Mean

STD

Constant

2.14

7.28

5.11

1.32

2.80

19.60

11.65

3.64

Water- content(%)

−5.45

3.18

−0.61

2.10

−8.07

6.44

−0.94

4.30

Elevation(m)

−1.89

1.16

−0.02

0.49

−4.23

2.62

0.02

1.22

PH

−2.02

0.86

−0.17

0.59

−3.55

2.45

−0.20

1.17

Temperature(°C)

−1.52

0.72

−0.10

0.42

−3.86

2.10

−0.21

0.99

Diagnostic Tests

GWR Anova Table

 

SS

DF

MS

F

P

Global Residuals

2717.14

5.00

   

GWR Improvement

1901.67

88.27

21.54

  

GWR Residuals

815.48

262.73

3.10

6.94

<0.05

Geographical variability tests of local coefficients

 

F

DOF for F test

DIFF of Criterion

Constant

4.19

2.83

−8.61

Water content

7.39

3.20

−25.92

Elevation

5.77

3.28

−12.03

PH

6.84

3.31

−15.74

Temperature

279.51

3.07

−388.96