Table of Control Chart Constants
|
Constants for X-bar chart |
Constants for R chart |
Constants for S chart |
|||||
|
Sample |
A2 |
A3 |
d2 |
D3 |
D4 |
B3 |
B4 |
|
2 |
1.880 |
2.659 |
1.128 |
- |
3.267 |
0 |
3.267 |
|
3 |
1.023 |
1.954 |
1.693 |
- |
2.574 |
0 |
2.568 |
|
4 |
0.729 |
1.628 |
2.059 |
- |
2.282 |
0 |
2.266 |
|
5 |
0.577 |
1.427 |
2.326 |
- |
2.114 |
0 |
2.089 |
|
6 |
0.483 |
1.287 |
2.534 |
- |
2.004 |
0.030 |
1.970 |
|
7 |
0.419 |
1.182 |
2.704 |
0.076 |
1.924 |
0.118 |
1.882 |
|
8 |
0.373 |
1.099 |
2.847 |
0.136 |
1.864 |
0.185 |
1.815 |
|
9 |
0.337 |
1.032 |
2.970 |
0.184 |
1.816 |
0.239 |
1.761 |
|
10 |
0.308 |
0.975 |
3.078 |
0.223 |
1.777 |
0.284 |
1.716 |
|
11 |
0.285 |
0.927 |
3.173 |
0.256 |
1.744 |
0.321 |
1.679 |
|
12 |
0.266 |
0.886 |
3.258 |
0.283 |
1.717 |
0.354 |
1.646 |
|
13 |
0.249 |
0.850 |
3.336 |
0.307 |
1.693 |
0.382 |
1.618 |
|
14 |
0.235 |
0.817 |
3.407 |
0.328 |
1.672 |
0.406 |
1.594 |
|
15 |
0.223 |
0.789 |
3.472 |
0.347 |
1.653 |
0.428 |
1.572 |
|
16 |
0.212 |
0.763 |
3.532 |
0.363 |
1.637 |
0.448 |
1.552 |
|
17 |
0.203 |
0.739 |
3.588 |
0.378 |
1.622 |
0.466 |
1.534 |
|
18 |
0.194 |
0.718 |
3.640 |
0.391 |
1.608 |
0.482 |
1.518 |
|
19 |
0.187 |
0.698 |
3.689 |
0.403 |
1.597 |
0.497 |
1.503 |
|
20 |
0.180 |
0.680 |
3.735 |
0.415 |
1.585 |
0.510 |
1.490 |
|
21 |
0.173 |
0.663 |
3.778 |
0.425 |
1.575 |
0.523 |
1.477 |
|
22 |
0.167 |
0.647 |
3.819 |
0.434 |
1.566 |
0.534 |
1.466 |
|
23 |
0.162 |
0.633 |
3.858 |
0.443 |
1.557 |
0.545 |
1.455 |
|
24 |
0.157 |
0.619 |
3.895 |
0.451 |
1.548 |
0.555 |
1.445 |
|
25 |
0.153 |
0.606 |
3.931 |
0.459 |
1.541 |
0.565 |
1.435 |