Sharp PC-1500 - Page 79

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PROGRAM
}(
- R CONTROL CHART
PROGRAM NO .
2
T I TL E PS- B- 14
Table 111 -3
Coefficients for
con trol limit calculation
Group
Sire A,
03
o.
n
2
1. 88 0 0 3.268
3 1.023 0 2.574
4
0.729
0 2.288
s
0.577
0
2.114
6
0.483
0
2.004
7 0.419 0. 076 1.924
8 0.373 0 .1 36 1.864
9
0.337 0. 184 1.816
10
0.308 0.2 23
1.777
[ Example I
I. X- R co ntrol cha rt is generated from the next data sheet.
Gro u1>
Meas ur ed values
No.
X1
Xz
X3
X4
Xs
I 4
6 6 6
s
2
s
5 s 9
4
3 8
10 13
9 s
4 10 8 2 3 2
5 5 3 4 4 4
6 3 3
4 4 2
7
4 8 11 10 12
8 8 3 12
12
10
9
4 4
5 3
3
10 5
3
4
8 5
11 3 12
12
13 5
12 5 5
13
10
5
13 4 I I 4
3
4
14 3 3 3
3
10
15 11 6 10 5 12
16
8 8 5 6 5
17 3 4 4
3
4
18 3
3 3
3 3
19 8 12
8
10 7
20 4 8 4 3 4
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