Control Chart Selection
Selecting Control Charts
| ATTRIBUTE DATA CHARTS |
| |
Defectives
(Binomial) |
Defects
(Poisson) |
Constant
Sample Sizes |
np
(Defectives) |
c
(Defects) |
Varying
Sample Sizes |
p
(Fraction Defective) |
u
(Defects Per Unit) |
|
CONTINUOUS
DATA CHARTS |
| Subgroup Size |
Chart |
| 1 |
I-MR |
| 2 ≤ n ≤ 9 |
XBar-R |
| n ≥ 10 |
XBar-s |
|
Control Chart Formulas
Control Chart Constants
| n |
A2 |
A3 |
B3 |
B4 |
D2 |
D3 |
D4 |
E2 |
| 2 |
1.88 |
2.66 |
0.00 |
3.27 |
1.13 |
0.00 |
3.27 |
2.66 |
| 3 |
1.02 |
1.95 |
0.00 |
2.57 |
1.69 |
0.00 |
2.57 |
1.77 |
| 4 |
0.73 |
1.63 |
0.00 |
2.27 |
2.06 |
0.00 |
2.28 |
1.46 |
| 5 |
0.58 |
1.43 |
0.00 |
2.09 |
2.33 |
0.00 |
2.11 |
1.29 |
| 6 |
0.48 |
1.29 |
0.03 |
1.97 |
2.53 |
0.00 |
2.00 |
1.18 |
| 7 |
0.42 |
1.18 |
0.12 |
1.88 |
2.70 |
0.08 |
1.92 |
1.11 |
| 8 |
0.37 |
1.10 |
0.19 |
1.82 |
2.85 |
0.14 |
1.86 |
1.05 |
| 9 |
0.34 |
1.03 |
0.24 |
1.76 |
2.97 |
0.18 |
1.82 |
1.01 |
| 10 |
0.31 |
0.98 |
0.28 |
1.72 |
3.08 |
0.22 |
1.78 |
0.98 |
| 11 |
0.29 |
0.93 |
0.32 |
1.68 |
3.17 |
0.26 |
1.74 |
|
| 12 |
0.27 |
0.89 |
0.35 |
1.65 |
3.26 |
0.28 |
1.75 |
|
| 13 |
0.25 |
0.85 |
0.38 |
1.62 |
3.34 |
0.31 |
1.69 |
|
| 14 |
0.24 |
0.82 |
0.41 |
1.59 |
3.41 |
0.33 |
1.67 |
|
| 15 |
0.22 |
0.79 |
0.43 |
1.57 |
3.47 |
0.35 |
1.65 |
|
| 16 |
0.21 |
0.76 |
0.45 |
1.55 |
3.53 |
0.36 |
1.64 |
|
| 17 |
0.20 |
0.74 |
0.47 |
1.53 |
3.59 |
0.38 |
1.62 |
|
| 18 |
0.19 |
0.72 |
0.48 |
1.52 |
3.64 |
0.39 |
1.61 |
|
| 19 |
0.19 |
0.70 |
0.50 |
1.50 |
3.69 |
0.40 |
1.60 |
|
| 20 |
0.18 |
0.68 |
0.51 |
1.49 |
3.74 |
0.42 |
1.59 |
|
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