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Tables of constants to calculate control limits
n
2
1,128
0,853
3
1,693
0,888
4
2,059
0,880
5
2,326
0,864
6
2,534
0,848
7
2,704
0,833
8
2,847
0,820
9
2,970
0,808
10
3,078
0,797
11
3,173
0,787
12
3,258
0,778
13
3,336
0,770
14
3,407
0,762
15
3,472
0,755
20
3,735
0,729
Estimation of Standard deviation
2
d
3
d
n
2
2,659
-
3,267
3
1,772
-
2,574
4
1,457
-
2,282
5
1,290
-
2,114
6
1,184
-
2,004
7
1,109
0,076
1,924
8
1,054
0,136
1,864
9
1,010
0,184
1,816
10
0,975
0,223
1,777
11
0,946
0,256
1,744
12
0,921
0,283
1,717
13
0,899
0,307
1,693
14
0,881
0,328
1,672
15
0,864
0,347
1,653
20
0,803
0,415
1,585
Constants used for control charts' limits calculation
4
A
3
D
4
D
Control chart: Calculation of control limits
n = number of data used to calculate the moving-range
A
NALYZE
03/10/17
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