---
alias: user-guide-spc-we1
description: "This document defines a rule based on deviation from a centerline, illustrated visually"
---

# Western Electric 1

## Rule definition

One point is more than three standard deviations from the centerline.

## Rule Scope

| Indicator Scope | Scope Type | Chart Type | Chart |
|-----------------|------------|------------|-------|
| Indicator1And2  | All        |            |       |

Table: Western Electric 1 configuration used for scope resolution

## Visual examples

### Indicator 1, Upper

![Western Electric 1 - Indicator 1 - Upper][N1_WE1_indicator1_upper]

### Indicator 1, Lower

![Western Electric 1 - Indicator 1 - Lower][N1_WE1_indicator1_down]

### Indicator 2, point 1

![Western Electric 1 - Indicator 2 - Point 1][N1_WE1_indicator2_v1]

### Indicator 2, point 2

![Western Electric 1 - Indicator 2 - Point 2][N1_WE1_indicator2_v2]

[N1_WE1_indicator1_upper]: images/N1_WE1_indicator1_upper.png
[N1_WE1_indicator1_down]: images/N1_WE1_indicator1_down.png
[N1_WE1_indicator2_v1]: images/N1_WE1_indicator2_v1.png
[N1_WE1_indicator2_v2]: images/N1_WE1_indicator2_v2.png