Abstract
Abstract A process is usually defined to be capable if a process capability index exceeds a stated threshold value. This definition can be expressed graphically as a region in the plane, defined by the process parameters, to obtain a process capability plot. Under the assumption of normality, safety regions can be plotted in the process capability plot to draw conclusions about process capability at a given significance level. Alternatively, an estimated process capability plot defined by the estimators of process parameters can be used. This article discusses these different kinds of plots and presents examples and interpretations.
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