Title: In weak statistical control?

Authors: Alexander Chakhunashvili, Bo Bergman

Addresses: Healthcare Improvement Unit, Administration and Development, Skaraborg's Hospital, 541 85 Skovde, Sweden; Division of Quality Sciences, Department of Technology Management and Economics, Chalmers University of Technology, Vera Sandbergs Alle 8, 412 96 Gothenburg, Sweden. ' Division of Quality Sciences, Department of Technology Management and Economics, Chalmers University of Technology, Vera Sandbergs Alle 8, 412 96 Gothenburg, Sweden

Abstract: There are usually two distinct objectives to attain a process in statistical control, including economic aspects, and predictability. While both objectives are important from a statistical quality control standpoint, they do not necessarily have to be fulfilled simultaneously. In this paper, we suggest a generalisation of the concept |in statistical control| especially useful for processes in which assignable causes of a certain kind are found, but their presence do not jeopardise the predictability (within limits) of the process. Such processes are referred in this paper as processes in weak statistical control.

Keywords: assignable causes of variation; capability indices; predictability; six sigma; statistical process control; SPC; statistical control; statistical quality control; SQC.

DOI: 10.1504/IJSSCA.2007.013391

International Journal of Six Sigma and Competitive Advantage, 2007 Vol.3 No.1, pp.91 - 102

Published online: 24 Apr 2007 *

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