What does the 'sigmas' parameter do?

6 vues

Réponse

The 'sigmas' parameter defines the width of the control limits. It is a multiple of the standard error of the subgroup summary statistic. The default value is 3, which creates standard 3-sigma control limits.
Did this answer help you?
cChart

spc

See technical action
Other questions about cChart
How does the `sigmas` parameter affect the control limits? What pattern is identified by `test2`? How does the action handle subgroups with varying sample sizes? What does the `allN` parameter do in the cChart action? Can I run tests for special causes if my control limits are not 3-sigma?
Copyright © WeAreCAS 2014-2026
SAS and all other SAS Institute Inc. product or service names are registered trademarks or trademarks of SAS Institute Inc. in the USA and other countries. ® indicates USA registration. WeAreCAS is an independent community site and is not affiliated with SAS Institute Inc.