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Viewing statistics from a quality control perspective

Gitlow, Howard S. - In: International Journal of Quality & Reliability Management 18 (2001) 2, pp. 169-179

Many students entering “Introduction to statistics” feel that statistics is a difficult subject that will have limited benefit to their lives. In this paper, a different vantage point for viewing the statistical process control section of a basic statistics course is presented to demonstrate...

Persistent link: https://www.econbiz.de/10014800078

Integrated process control

Luis Duarte Ribeiro, José; Schwengber ten Caten, Carla; … - In: International Journal of Quality & Reliability Management 18 (2001) 4, pp. 444-464

Presents a new procedure for quality control and quality assurance in scenarios where several variables and attributes have to be monitored. The proposed procedure, named integrated process control, begins with the definition of control stations on the production line, where a single chart that...

Persistent link: https://www.econbiz.de/10014800090

Outage costs and strategy analysis for hi‐tech industries

Juei Wang, Earl - In: International Journal of Quality & Reliability Management 19 (2002) 8/9, pp. 1068-1087

Herein a cost minimization model with fuzzy multiple goals to determine available alternatives, which will economically enhance the quality of electricity within high‐tech industries is developed. The proposed model focuses on the worsening phenomenon of the quality of electricity within...

Persistent link: https://www.econbiz.de/10014800163

Costs and benefits of inspection systems and optimal inspection allocation for uniform defect propensity

Freiesleben, Johannes - In: International Journal of Quality & Reliability Management 23 (2006) 5, pp. 547-563

Purpose – The objective of this paper is to demonstrate basic economic principles underlying the use of inspection … systems and to derive a basis for comparing inspection costs with the alternative costs of quality improvement. Design …/methodology/approach – For this purpose, the impact of final, rectifying and sequential inspection on unit production costs is assessed using a …

Persistent link: https://www.econbiz.de/10014800369

Developing statistical thinking for performance improvement in the food industry

Grigg, Nigel Peter; Walls, Lesley - In: International Journal of Quality & Reliability Management 24 (2007) 4, pp. 347-369

Purpose – The paper aims to describe a recently completed research project on the use of statistical quality control (SQC) methods in the context of food and drinks manufacturing. It discusses issues surrounding the successful uptake of such methods, including organisational motivation,...

Persistent link: https://www.econbiz.de/10014800419

Control charts with predetermined sampling intervals

Rodrigues Dias, J.; Infante, Paulo - In: International Journal of Quality & Reliability Management 25 (2008) 4, pp. 423-435

Purpose – The purpose of this paper is to investigate a new sampling methodology previously proposed for systems with a known lifetime distribution: the Predetermined Sampling Intervals (PSI) method. Design/methodology/approach – The methodology is defined on basis of system hazard...

Persistent link: https://www.econbiz.de/10014800477

Optimal economic solution for a normal sampling intervals method in quality control

Rodrigues Dias, J. - In: International Journal of Quality & Reliability Management 26 (2009) 1, pp. 59-75

Purpose – The main purpose of this paper is to present an optimal economic solution for a different adaptive sampling method that is highly intuitive in its nature: the normal sampling intervals (NSI) method. Design/methodology/approach – Considering costs associated with sampling, false...

Persistent link: https://www.econbiz.de/10014800512

Extending zone rules to detect process drift

Divoky, James J.; Anne Rothermel, Mary - In: International Journal of Quality & Reliability Management 26 (2009) 1, pp. 97-104

Purpose – The purpose of this paper is to explore and analyze the effectiveness of long period supplementary zone rules that can simultaneously increase chart sensitivity to small process drift and not significantly increase the false alarm rate. Design/methodology/approach – A stable,...

Persistent link: https://www.econbiz.de/10014800514

Multi‐response unreplicated‐saturated Taguchi designs and super‐ranking in food formulation improvement

Besseris, George J. - In: International Journal of Quality & Reliability Management 26 (2009) 4, pp. 341-368

Purpose – The aim of this paper is to examine product formulation screening at the industrial level in terms of multi‐trait improvement by considering several pertinent controlling factors. Design/methodology/approach – The study adopts Taguchi's orthogonal arrays (OAs) for sufficient and...

Persistent link: https://www.econbiz.de/10014800529

The demerit‐based control chart for trinomial distribution

Chattinnawat, Wichai - In: International Journal of Quality & Reliability Management 26 (2009) 5, pp. 426-448

Purpose – The purpose of this paper is to investigate the properties of the classical goodness of fit test statistics X 2 , G 2 , GM 2 , and NM 2 in testing quality of process represented as the trinomial distribution with dip null hypothesis and to devise a control chart for the trinomial...

Persistent link: https://www.econbiz.de/10014800535