Xbar-R Chart

This node outputs SPC XBAR-R Chart and performs control tests.

Type

SPC-Chart

Class

fire.nodes.graph.NodeSpcXbarRChart

Fields

Name	Title	Description
title	Title
titleColor	Title Color
description	Description
descriptionColor	Description Color
measurements	Measurements Columns	Measurements column names
identifier	Identifier Columns	Identifier column names
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
test5	k out of k+1 consecutive points are one side of the centerline
test6	k out of n consecutive points are one side of the centerline

Details

The XBAR-R chart is a control chart in Statistical Process Control (SPC) used to monitor the process mean and variability using small sample sizes. The “XBAR” chart tracks the average (mean) of samples over time, while the “R” chart monitors the range (difference between the highest and lowest values) within each sample, reflecting process variability. It is most effective when sample sizes are small (typically 2 to 10 units per subgroup). The XBAR-R chart helps identify shifts in the process mean and changes in variability, ensuring the process remains stable and under control for consistent quality.