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Process shift modes
Wu, Zhang - In: International Journal of Quality & Reliability Management 12 (1995) 1, pp. 53-60
classifications), each of which is characterized by the shift magnitude (δ) and the occurrence probability, f. The knowledge relating … to the shift modes is useful to the improvement of the effectiveness of the control charts and to the reduction of the …
Persistent link: https://www.econbiz.de/10014800974
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Process Goal Charts for Quality Improvement Programmes
White, Edna M.; Kaighobadi, Mehdi; Wharton, T.J. - In: International Journal of Quality & Reliability Management 11 (1994) 2, pp. 26-40
Total quality management programmes emphasizing continuous improvement have become increasingly popular as companies … perceive the importance of quality in maintaining or enhancing their competitive position. Although improvement programmes are … extremely valuable, they do not eliminate the eed for control. Unfortunately, companies striving for quality improvement may de …
Persistent link: https://www.econbiz.de/10014800926
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There’s nothing normal about SPC!
Neave, Henry R. - In: Training for Quality 5 (1997) 3, pp. 106-111
arguments as to why the “orthodox” statistician claims that normality is necessary. One is to enable probability interpretations …. The truth is that, even under normality, the usual probability interpretations are meaningless in practice and that, in … very similar over a wide range of differently‐shaped probability distributions.  …
Persistent link: https://www.econbiz.de/10015028383
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The MaxMin EWMA tolerance limits
Amin, Raid W.; Li, Kuiyuan - In: International Journal of Quality & Reliability Management 17 (2000) 1, pp. 27-41
When there is a change in a process, the MaxMin exponentially weighted moving average (EWMA) control chart shows which parameters have increased or decreased. The MaxMin EWMA may also be viewed as smoothed tolerance limits. Tolerance limits are limits that include a specific proportion of the...
Persistent link: https://www.econbiz.de/10014800010
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Implementation of a quality procedure based on Delphi method and the ISO/TS 16949:2009 in the production of stainless steel tubes for automotive exhaust systems
Bevilacqua, Maurizio; Emanuele Ciarapica, Filippo; … - In: International Journal of Quality & Reliability Management 28 (2011) 8, pp. 841-866
Purpose – The purpose of this paper is to present the application of a procedure for the quality control of stainless steel tubes produced for automotive exhaust systems from a leading company in the steel sector, based on the Delphi method in accordance with the ISO/TS 16949:2009 and the ISO...
Persistent link: https://www.econbiz.de/10014800663
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Optimizing Process Control Parameters
Gupta, A.D.; Sachdev, Anil - In: International Journal of Quality & Reliability Management 9 (1992) 1
Presents a modification of Saniga′s model for joint economic design of process control parameters, i.e. sample size, sampling frequency and critical regions for X and R charts. The objective is to minimize the total system cost, which consists of the cost of sampling and charting, the cost of...
Persistent link: https://www.econbiz.de/10014800848
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An Efficient Procedure for the Economic Design of np‐Control Charts
Chung, Kun‐Jen - In: International Journal of Quality & Reliability Management 9 (1992) 4
Presents two production models for maintaining current control of an industrial process under the surveillance of an np ‐control chart. The first model assumes that the process is not allowed to continue in operation during the search for the assignable cause. The second assumes that the...
Persistent link: https://www.econbiz.de/10014800863
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An EWMA Quality Control Procedure for Jointly Monitoring the Mean and Variance
E. Shamma, Shawky; W. Amin, Raid - In: International Journal of Quality & Reliability Management 10 (1993) 7
Persistent link: https://www.econbiz.de/10014800883
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Single • Control Chart Scheme
Wu, Zhang - In: International Journal of Quality & Reliability Management 11 (1994) 9, pp. 34-42
States that, under certain circumstances, a single • control chart with tightened control limits may be more effective for detecting process shifts than the combination of • and s control charts, while the type I error can be kept at the same level. A computer program is developed to decide...
Persistent link: https://www.econbiz.de/10014800961
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Process adjustment when using EWMA charts
Johan Wiklund, Stig - In: International Journal of Quality & Reliability Management 12 (1995) 2, pp. 8-27
adjustment based on the ML‐estimator provides substantial improvement over the EWMA statistic when the smoothing constant of the …
Persistent link: https://www.econbiz.de/10014800977