Six Sigma SPC - Statistical Process Control

Six Sigma SPC's Quality Control Dictionary and Glossary
2070 W. Washington St. #5 Springfield IL 62702  Ph: 217.698.0063
6 Sigma Statistical Process Control (SPC) Software for Windows 95/98/NT/2000/XP/ME

Home Search Capability Studies Links

Click Here!

Prices FAQ
About Support
Contact Quality Control Dictionary and Glossary Free Desktop 6 Sigma Calculator Forum
Quality Books Articles Free Online 6 Sigma Calculator Free Newsletter

Variable data

Any data measurements that are quantified on an infinitely divisible numeric scale. Includes items like lengths, diameters, temperatures, electrical measurements, or hours, (i.e. blue print specifications, electrical specifications, etc.) that have measurements like 2.34, 2.55, etc.

The opposite of Discrete or Attribute data. These data types measure items like pass or fail, leak or no leak, small, medium, or large, go or no go tests.

It may be easier and accurate to use variable data in a six sigma measurement.

Variable data types are required to use X-Bar and R-Bar control charts. They usually have more significance and thus research by Motorola would indicate that this data type typically requires fewer samples than discrete data types to have the same confidence level. Samples should be taken using systematic sampling.

Back to the Quality Control Dictionary and Glossary

Click Here!


Copyright 2005 Six Sigma SPC / Jim Winings All Rights Reserved
Privacy Statement - Disclaimer - Copyright - Site Map

Last Updated: Wednesday, 17-May-06 10:21:05 PDT