F

P (

Significance

Wells (w)

0.2537

0.6145

No

Years (y)

72.0601

2.2E−16

Yes

Bores (b)

4870.72

2.2E−16

Yes

w+y

0.3379

0.561

No

w+b

39.5954

3.2E−10

Yes

y+b

65.4259

6.5E−16

Yes

w+y+b

1.7819

0.1819

No