engleski

SIGMA – MEASURE OF QUALITY

The dispersion value defines the level of quality of a certain process or product characteristic. Since the measure of dispersion in statistics represents the standard deviation σ, it may be claimed that σ is at the same time the measure of quality. If level 6σ represents the practically perfect result (quality) the so-called σ-level of the process should be determined in order to estimate the possibility of its improvement. The examples presented in this paper show that the estimation of σ-level is not just the application of a simple statistical calculus.

quality control; Six Sigma; control charts; σ-level

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