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Table 3 Results of statistical tests at the significance level α = 0.05

From: Piecewise modelling and parameter estimation of repairable system failure rate

Test methods

Statistics

Critical value

Calculated value

Results

Laplace test

U

1.96

1.35

Show a non-monotonic trend

Anderson–Darling test

V 1

1.96

3.32

Follow the trend of bathtub curve

V 2

1.96

4.08

V 3

192.47

68.65