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Table 15 Descriptive statistics of the unit test case metrics (K-means clustering)

From: A metrics suite for JUnit test code: a multiple case study on open source software

 

Cluster 1

Cluster 2

Cluster 3

Cluster 4

Cluster 5

Nb. Obs.

587

267

118

38

17

TLOC

Min

6

8

10

16

18

Max

1280

2035

2236

2624

4063

Mean (μ)

84.78

146.99

289.71

399.08

779.59

Std. Dev (σ)

110.60

208.20

434.08

605.59

996.46

Coef. of var (C v  = σ/μ)

1.304

1.416

1.498

1.517

1.278

TASSERT

Min

0

0

0

1

2

Max

329

1058

1014

1156

396

Mean (μ)

17.76

36.88

84.70

130.40

149.35

Std. Dev (σ)

34.36

86.89

165.35

243.50

136.26

Coef. of var (C v  = σ/μ)

1.935

2.356

1.952

1.867

0.912

TDATA

Min

0

0

0

0

0

Max

324

482

393

482

758

Mean (μ)

11.64

22.31

43.62

56.79

98.94

Std. Dev (σ)

21.62

44.61

75.64

106.23

172.48

Coef. of var (C v  = σ/μ)

1.857

2

1.734

1.871

1.743

TINVOK

Min

0

2

1

6

2

Max

175

192

401

399

516

Mean (μ)

26.28

34.34

60.75

72.87

86.29

Std. Dev (σ)

27.04

31.10

61.49

84.23

114.92

Coef. of var (C v  = σ/μ)

1.029

0.906

1.012

1.156

1.332

TNOO

Min

0

1

1

1

3

Max

153

164

242

238

148

Mean (μ)

6.19

10.27

21.09

30.74

29.65

Std. Dev (σ)

10.38

17.74

39.20

53.56

35.95

Coef. of var (C v  = σ/μ)

1.678

1.728

1.859

1.743

1.213