U Chart

This node outputs SPC U Chart and performs control tests.

Type

SPC-Chart

Class

fire.nodes.graph.NodeSpcUChart

Fields

Name	Title	Description
title	Title
titleColor	Title Color
description	Description
descriptionColor	Description Color
attribute	Attribute Columns	Attribute column names
subgroup	Subgroup Column	Subgroup column name
identifier	Identifier Columns	Identifier column name
test1	point beyond the control limits
test2	k or more consecutive points are one side of the centerline
test3	k or more consecutive points are increasing or decreasing
test4	k consecutive points alternate up or down

Details

The U chart in Statistical Process Control (SPC) is used to monitor the number of defects per unit in a process where the sample size can vary. Unlike other control charts, the U chart accounts for different sample sizes by focusing on the defect rate rather than the absolute number of defects. It tracks the average number of defects per unit over time, making it ideal for processes with varying opportunities for defects, such as healthcare or service industries. The U chart helps detect shifts, trends, or outliers, ensuring the process remains stable and defect rates stay within control limits.