Table 1 Control charts for n1 = 5, n2 = 10, \(\psi\)= 0.10.

From: Adaptive VSS-EWMA control chart for monitoring the process dispersion

Δ

CC

ARL

SDRL

P05

P10

P25

P50

P75

P90

P95

0

FEWMA

1

0

1

1

1

1

1

1

1

VAEWMA

1

0

1

1

1

1

1

1

1

0.25

FEWMA

1.63

0.53

1

1

1

2

2

2

2

VAEWMA

1.98

0.19

2

2

2

2

2

2

2

0.50

FEWMA

3.82

1.62

2

2

3

4

5

6

7

VAEWMA

3.17

0.91

2

2

3

3

4

4

5

0.75

FEWMA

15.00

9.75

3

5

8

13

20

28

34

VAEWMA

9.60

4.98

3

4

6

9

12

16

19

0.90

FEWMA

87.40

81.45

8

14

30

63

118

196

252

VAEWMA

54.65

47.01

7

11

22

41

73

116

147

1.0

FEWMA

369.23

360.29

14

34

100

249

503

837

1080

VAEWMA

370.66

363.93

18

38

107

258

524

881

1060

1.05

FEWMA

165.38

166.01

8

17

47

113

230

383

497

VAEWMA

136.72

132.06

9

17

43

97

189

308

403

1.25

FEWMA

15.00

12.22

2

3

6

12

20

31

39

VAEWMA

10.99

7.58

2

3

5

9

15

21

26

1.50

FEWMA

5.22

3.85

1

1

2

4

7

10

13

VAEWMA

4.42

2.50

2

2

3

4

6

8

9

2

FEWMA

2.17

1.40

1

1

1

2

2

3

4

VAEWMA

2.26

1.03

1

1

2

2

3

4

4

3

FEWMA

1.28

0.56

1

1

1

1

1

2

3

VAEWMA

1.42

0.57

1

1

1

1

2

2

2

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