Missing values omitted for…

All

Issues

Withdrawal capacity

In/out ratio

Well depth

Injection horizon

Casing material

Casing diameter

Injection formation

Transmissivity

Confinement

Model Statistics

Observations

204

120

126

121

125

111

112

99

121

51

60

Classification accuracy (null model) (%)

57.7

59.5

58.3

59.8

57.9

58.0

59.3

56.0

57.4

57.7

52.5

Classification accuracy (with variables) (%)

67.7

90.1

69.3

69.7

68.3

71.4

69.0

69.0

72.1

61.5

77.0

Improvement of classification accuracy (%)

10

30.6

11

9.9

10.4

13.4

9.7

13.0

14.7

3.8

24.5

P-value of Hosmer and Lemeshow test [39]

0.267

0.837

0.329

0.220

0.528

0.506

0.308

0.218

0.238

0.421

0.475

Cox & Snell Pseudo R² [40]

0.142

0.583

0.170

0.178

0.161

0.173

0.197

0.115

0.211

0.039

0.432

Nagelkerke Pseudo R² [41]

0.192

0.788

0.229

0.241

0.216

0.233

0.266

0.155

0.284

0.053

0.576

Regression Coefficients (Log-Odds)

Constant

21.021

−1.868

−0.162

−0.184

−0.752

−0.883

−19.841

−0.152

−0.890

−0.215

−21.203

Region-Southeast Coast

−0.389

1.573

−0.414

−0.460

0.140

0.550

0.195

0.369

−0.103

0.983

−2.569

Region-California

1.571

5.559

2.645

2.569

2.342

2.720

2.056

1.889

0.831

1.029

36.197

Region-Pacific Northwest

0.182

3.737

0.320

0.088

0.802

1.300

0.537

0.530

−22.309

0.390

29.670

Region-Basin Range

0.713

3.277

0.634

0.757

1.003

2.066

1.031

1.050

−0.030

1.124

−0.413

Region-Mid-Atlantic

1.588

1.710

1.567

1.459

1.897

2.534

2.239

2.157

0.462

0.590

18.767

Issue-Clogging

-

−4.490

-

-

-

-

-

-

-

-

-

Issue-Tested then abandoned

-

−26.549

-

-

-

-

-

-

-

-

-

Issue-Recovery problems

-

−25.282

-

-

-

-

-

-

-

-

-

Issue-Water quality or arsenic problems

-

−5.616

-

-

-

-

-

-

-

-

-

Issue-Expired permit

-

18.236

-

-

-

-

-

-

-

-

-

Water source-groundwater

−21.476

3.263

−0.289

−0.469

−0.411

−0.997

−20.048

−0.503

0.244

−0.270

5.097

Water source-reclaimed water

−21.102

3.871

0.133

−0.349

0.077

−0.776

−19.139

−0.038

0.394

−0.833

4.658

Water source-surface runoff

−21.021

2.774

0.191

−0.039

−0.032

−0.379

−19.477

0.011

0.645

−0.253

6.235

Withdrawal capacity (MGD)

-

-

0.001

−0.004

-

-

-

-

-

-

-

In/out ratio

-

-

-

−0.432

-

-

-

-

-

-

-

Well depth (ft)

-

-

-

-

0.001

0.001

0.000

-

-

-

-

Injection horizon (ft)

-

-

-

-

-

−0.001

-

-

-

-

−0.003

Casing material-steel

-

-

-

-

-

-

38.840

-

-

-

-

Casing material-PVC

-

-

-

-

-

-

38.116

-

-

-

-

Casing material-stainless steel

-

-

-

-

-

-

39.562

-

-

-

-

Casing diameter (ft)

-

-

-

-

-

-

-

−0.028

-

-

-

Injection formation-sandstone

-

-

-

-

-

-

-

-

0.203

-

-

Injection formation-sand

-

-

-

-

-

-

-

-

1.097

-

-

Injection formation-limestone

-

-

-

-

-

-

-

-

−0.144

-

-

Injection formation-alluvial

-

-

-

-

-

-

-

-

1.352

-

-