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What Subgroup Level Control Tests come preconfigured with WinSPC?
Article Details

Last Updated
31st of December, 2013

Applies to
WinSPC 7.2, WinSPC 8.0, WinSPC 8.1, WinSPC 8.2, WinSPC 8.3

Introduction
WinSPC allows you to set up rules known as Control Tests against your control charts in Data Collection mode. These Control Tests are referred to as Subgroup Level Control Tests. When violated, WinSPC can be configured to react by using triggers.  

WinSPC comes preconfigured with the most common Subgroup Level Control Tests.
For information on how to create your own custom Subgroup Level Control Tests, please reference the WinSPC Version 8 Administrator Training Manual, Chapter 24, Page 395, as well as additional information in the following knowledgebase article for WinSPC versions 8.3.4 and newer: http://knowledgebase.winspc.com/questions/311

These tests are broken up into families of tests, based on various commonly used SPC methodologies. These include the Shewhart, Western Electric, and Nelson tests.
 
Table of Preconfigured WinSPC Subgroup Level Control Tests

Family - The family indicates which set or family of rules the Subgroup Level Control Test is based on.
Test -  The test is the name of the Subgroup Level Control Test as it appears in the WinSPC Tree.
Definition - Reference to the actual syntax used by WinSPC that defines a named given test.
Color - The control test will cause the subgroup listed on the Control Chart to change color to highlight the violation on the chart. The severity of the color appears in Data Collection as well as Plant Monitor.
Description - The description of the Subgroup Level Control Test, as it appears inside WinSPC.

Family Test Definition Color Description
Standard 1 pt beyond control limits RUN(PRI,1,1,Z) RED A single point outside of the control limits
Nelson 1 pt beyond Zone A  RUN(PRI,1,1,Z) RED A single point beyond Zone A.
2/3 pts Zone A or beyond  RUN(PRI,2,3,A+) RED Two out of three points in a row in Zone A or beyond on one side of the center line.
4/5 pts Zone B or beyond RUN(PRI,4,5,B+) RED Four out of five points in a row in Zone B or beyond on one side of the center line.
9 pts Zone C or beyond RUN(PRI,9,9,C+, ONE SIDE) RED Nine points in a row in Zone C or beyond on one side of the center line.
Mixture RUN(PRI,8,8,B+,BOTH SIDES) PURPLE Eight points in a row on both sides of the center line but none falling in Zone C.
Stratification RUN(PRI,15,15,C,BOTH SIDES) PURPLE Fifteen points in a row all in Zone C, with at least one point on each side of the center line.
{PRI} decreasing TREND(PRI,6,DOWN) YELLOW Six points in a row, each one smaller than its predecessor.
{PRI} increasing TREND(PRI,6,UP) YELLOW Six points in a row, each one larger than its predecessor.
{PRI} not changing TREND(PRI,6,STEADY) YELLOW Six points in a row, each one equal to its predecessor.
{SEC} decreasing TREND(SEC,6,DOWN) YELLOW Six points in a row, each one smaller than its predecessor.
{SEC} increasing TREND(SEC,6,UP) YELLOW Six points in a row, each one larger than its predecessor.
{SEC} not changing TREND(SEC,6,STEADY) YELLOW Six points in a row, each one equal to its predecessor.
Shewhart 1 pt beyond Zone A RUN(PRI,1,1,Z) RED A single point beyond Zone A.
Western Electric* 1 pt beyond Zone A  RUN(PRI,1,1,Z) RED A single point beyond Zone A.
2/3 pts Zone A or beyond  RUN(PRI,2,3,A+) RED Two out of three points in a row in Zone A or beyond on one side of the center line.
4/5 pts Zone B or beyond RUN(PRI,4,5,B+) RED Four out of five points in a row in Zone B or beyond on one side of the center line.
8 pts Zone C or beyond RUN(PRI,8,8,C+,ONE SIDE) RED Eight points in a row in Zone C or beyond on one side of the center line.
Mixture RUN(PRI,8,8,B+,BOTH SIDES) PURPLE Eight points in a row on both sides of the center line but none falling in Zone C.
Stratification RUN(PRI,15,15,C,BOTH SIDES) PURPLE Fifteen points in a row all in Zone C, with at least one point on each side of the center line.
{PRI} decreasing TREND(PRI,6,DOWN) YELLOW Six points in a row, each one smaller than its predecessor.
{PRI} increasing TREND(PRI,6,UP) YELLOW Six points in a row, each one larger than its predecessor.
{PRI} not changing TREND(PRI,6,STEADY) YELLOW Six points in a row, each one equal to its predecessor.
{SEC} decreasing TREND(SEC,6,DOWN) YELLOW Six points in a row, each one smaller than its predecessor.
{SEC} increasing TREND(SEC,6,DOWN) YELLOW Six points in a row, each one larger than its predecessor.
{SEC} not changing TREND(SEC,6,STEADY) YELLOW Six points in a row, each one equal to its predecessor.

*Western Electric rules are sometimes also referred to as AT&T rules.
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