SIX SIGMA Glossary: Measures of Dispersion

Measures of dispersion measure the spread of the data. Dispersion is central to process improvement because a fundamental aim of Six Sigma is to minimize the amount of variation.

The 'standard deviation' is the most common measure of process improvement. The Mean Square Error is a closely related concept used in, for example, ANOVA.

Measures of Dispersion include:

Range

Standard Deviation

Variance

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