P Chart

This node outputs SPC P Chart and performs control tests.

Type

SPC-Chart

Class

fire.nodes.graph.NodeSpcPChart

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 P chart, or Proportion Chart, in Statistical Process Control (SPC) is used to monitor the proportion of defective or non-conforming units in a process. It tracks the percentage of defective items in a sample over time, helping to detect any significant changes in quality. The P chart is ideal for processes where data are categorical (e.g., pass/fail, defective/non-defective) and where sample sizes may vary. By identifying trends, shifts, or out-of-control points, the P chart helps maintain process stability and ensure that the proportion of defects remains within acceptable control limits.