Table 4 Coefficients and statistical parameters based on codes in Table 3.

From: Impact of atmospheric conditions on the flash-over voltage of the transmission line insulators using central composite design

 

Estimate

SE

t-test

p-Value

Intercept

109.69

0.62301

176.06

5.03E-14

P

-1.5

0.46042

-3.2579

0.013905

A

18.3

0.46042

39.746

1.66E-09

T

-4.3

0.46042

-9.3393

3.35E-05

P: A

0.375

0.51477

0.72849

0.48996

P: T

0.875

0.51477

1.6998

0.13297

A: T

0.125

0.51477

0.24283

0.8151

P^2

-2.4577

0.8895

-2.7631

0.027973

A^2

-8.4577

0.8895

-9.5084

2.98E-05

T^2

4.5423

0.8895

5.1065

0.001389

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