Time Series Controls
Run Rules
This page describes the rules of the time series controls.
You can enable/disable as well as
add custom rules. The time series controls are:
The rules for the time series controls are located at the
limit range level.
A rule of the controls is of the following type:
The first step is to include the necessary namespace
for the controls and add a new time series.
Built-in Rules
The table below describes the rules that are built-in to the controls. These
rules may be modifed, such as changing the limit and run/fail lengths, or
new rules may be added.
|
| Rule Name |
Rule Description |
Upper Limit |
Lower Limit |
Run Length |
Fail Length |
| Western Electric Rule #1 |
One point above or below the control limits |
UCL |
LCL |
1 |
1 |
| Western Electric Rule #2 |
Run above or below centerline |
- |
CL |
7 |
7 |
| Western Electric Rule #3 |
Trend |
- |
- |
7 |
7 |
| Western Electric Rule #4 |
Cyclic |
- |
- |
14 |
14 |
| Western Electric Rule #5 |
Two out of three in Zone A or beyond |
2 Sigma |
-2 Sigma |
3 |
2 |
| Western Electric Rule #6 |
Four out of five in zone B or beyond |
1 Sigma |
-1 Sigma |
5 |
4 |
| Western Electric Rule #7 |
Fifteen consecutive points between +/- 1 sigma |
1 Sigma |
-1 Sigma |
15 |
15 |
| Western Electric Rule #8 |
No points between +/- 1 sigma |
1 Sigma |
-1 Sigma |
8 |
0 |
| Western Electric Rule #9 |
One point outside specification limits |
USL |
LSL |
1 |
1 |
|