Control chart parameters

SIF2009

SIF2014

SIF2015

UCL_x

21.85

36.91

30.84

14.41

13.47

12.14

LCL_x

6.96

−9.96

−6.56

SP_x

14.89

46.87

37.40

N

370

629

503

K

5

5

5

N_sg

74

124

100

N_ocp

13

12

8