Table 2 Multi–collinearity values for several explanatory factors.

From: Source identification and potential health risks from elevated groundwater nitrate contamination in Sundarbans coastal aquifers, India

Factors

Collinearity analysis

TOL

VIF

K+

0.636

1.573

PO42− (mg/l)

0.491

2.038

As (μg/l)

0.021

1.226

SO42− (mg/l)

0.605

1.652

HCO3− (mg/l)

0.286

3.498

Cl− (mg/l)

0.041

6.375

Na+ (mg/l)

0.101

8.75

EC (μS/cm)

0.056

7.92

pH

0.445

2.247

F− (mg/l)

0.778

1.28

Temperature (°C)

0.738

1.355

Water depth (m)

0.607

1.64

Mg2+ (mg/l)

0.336

2.98

Salinity

0.721

1.38

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