NP Chart

This node outputs SPC NP Chart and performs control tests.

Type

SPC-Chart

Class

fire.nodes.graph.NodeSpcNPChart

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 NP chart in Statistical Process Control (SPC) is used to monitor the number of defective items in a process where the sample size remains constant. It tracks the count of non-conforming units in each sample, making it suitable for processes where defects are classified as pass/fail or defective/non-defective. The NP chart helps detect changes in the process by highlighting trends, shifts, or out-of-control points. By maintaining stability and ensuring the number of defects stays within control limits, the NP chart is useful for quality control in manufacturing and other industries with consistent sample sizes.