The Six Sigma Handbook, Fourth Edition by Thomas Pyzdek & Paul Keller

The Six Sigma Handbook, Fourth Edition by Thomas Pyzdek & Paul Keller

Author:Thomas Pyzdek & Paul Keller
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2014-07-14T16:00:00+00:00


Principles of Statistical Process Control

A central concept in statistical process control (SPC) is that every measurable phenomenon is a statistical distribution. In other words, an observed set of data constitutes a sample of the effects of unknown common causes. It follows that, after we have done everything to eliminate special causes of variations, there will still remain a certain amount of variability exhibiting the state of control. Figure 7.5 illustrates the relationships between common causes, special causes, and distributions.



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