Standard rules and calculation types
- Last UpdatedNov 04, 2024
- 1 minute read
The standard rules from the MES database are described in the following table.
|
Rule ID |
Description |
|---|---|
|
0 |
1 point beyond/outside control limits |
|
1 |
2 of 3 outside 2 standard deviations |
|
2 |
3 of 7 outside 2 standard deviations |
|
3 |
4 of 10 outside 2 standard deviations |
|
4 |
4 of 5 outside 1 standard deviation |
|
5 |
7 of 7 on one side of centerline (that is, outside 0 standard deviations) |
|
6 |
8 of 8 on one side of centerline |
|
7 |
8 of 8 beyond 1 standard deviation |
|
8 |
9 of 9 on one side of centerline |
|
9 |
10 of 11 on one side of centerline |
|
10 |
12 of 14 on one side of centerline |
|
11 |
6 of 6 trending up or down |
|
12 |
7 of 7 trending up or down |
Points beyond standard deviations are either above the positive number or below the negative number of standard deviations together. Points outside standard deviations are the violating points. They are either above the positive number of standard deviations, or below the negative number of standard deviations. It is easier to violate a Beyond rule than an Outside rule, if all the other values are the same.
The calculation for obtaining standard deviation depends on the following:
-
Chart type
-
Control limit source
-
Sigma estimation method configured for a characteristic
For more information see About Calculating Process Statistics.