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ABSTRACT
In industrial processes, capability indices like the Cpk are frequently used. This index requires that specification limits have been set. The current paper focuses on the issue to set preliminary specification limits based on the statistical performance of the process alone. This preliminary interval should correspond to a Cpk value that is considered to be sufficiently high, with a pre-specified confidence level. The paper presents a theoretical framework to set these limits.
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Notes on contributors
Jos J. A. M. Weusten
Jos J. A. M. Weusten has been working in the field of applied statistics in an industrial environment since 1993, initially in a company for medical devices, later in the chemical industry. He has published a number of articles in a variety of fields, like nucleic acid technology, forensic sciences, blood safety scenarios, and two-dimensional gas chromatography.
Peter H. G. Tummers
Peter H. G. Tummers has been working in the fields of process analysis and applied statistics in an industrial environment since 1987. He has been applying statistical methods mainly in the fields of analytical chemistry and statistical process control.