Results 261 to 270 of about 424,805 (289)
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Tutorial on Risk Adjusted X-Bar Charts
Quality Management in Health Care, 2001Two data elements are needed for constructing a risk-adjusted X-bar chart. They are a continuous observed outcome collected over time across a sample of patients, and an expected outcome for each patient. The authors selected blood glucose levels to reflect diabetes control.
F, Alemi, T, Sullivan
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Estimation in X-bar control charts: effects and corrections
The International Journal of Advanced Manufacturing Technology, 2014This paper presents an approach for improving the control limits of \( \overline{X} \) control charts when the parameters of the process are estimated and the control chart is in operation. In these conditions, the observed average run length (ARL) may be very different from the planned ARL since the parameter estimates may have a larger error.
Roberto da Costa Quinino +2 more
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Minimum-loss design of x-bar charts for correlated data
Journal of Loss Prevention in the Process Industries, 2002Abstract When the x-bar chart is used to monitor a production process, three parameters should be determined: the sample size, the sampling interval between successive samples, and the control limits for the chart. In 1956, Duncan presented a cost model to determine the three parameters, which is called the economic design of x-bar charts.
Hui-Rong Liu +2 more
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Effect of measurement errors on triple sampling X¯${{\bar{\bm X}}}$ chart
Quality and Reliability Engineering International, 2022AbstractThe performance of the triple sampling (TS) chart is investigated by using a linear covariate error model that considers the presence of measurement errors (ME), called the TS‐ME chart. The sensitivity of the TS‐ME chart is evaluated by means of the average run length (ARL) and standard deviation of the run length (SDRL) performance measures ...
Adamu A. Umar +3 more
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Combined X-bar and CRL Charts for the Gamma Process
Computational Statistics, 2003A quality control problem for non-normally distributed observations is considered. For combined \(\bar x\) and CRL charts (the synthetic charts) control limits and performance are investigated in the case of (shifted) gamma distribution of the observations (with known parameters).
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Grey relation pattern recogniser for X-bar control charts
International Journal of Manufacturing Technology and Management, 2000This paper has developed an on-line pattern recogniser to detect unnatural patterns on control charts. The recogniser can assist in the correction of assignable causes. The recogniser presented here is based on the grey relation model which is used to calculate the degree of relative similarity between observations routinely collected from X-bar charts
Hsi-Mei Hsu, Yan-Kwang Chen
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Robust economic-statistical design of X-bar control chart
International Journal of Production Research, 2015Control charts are developed to monitor the service and production processes. The fact that many processes have uncertain parameters is a barrier to obtain the best design of the control charts. In this paper, economic statistical design (ESD) of the X-bar control chart utilising robust optimisation approach that considers interval estimates of ...
Abdul Sattar Safaei +2 more
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The effect of correlation on the economic design of warning limit X-bar charts
The International Journal of Advanced Manufacturing Technology, 2003Control charts are widely applied to monitor manufacturing processes. In 1962, Page presented a modified X-bar chart with warning limits, which includes an upper and lower warning band. In 1975, Gordon and Weindling presented a cost model for determining the five parameters of a warning limit X-bar chart: i.e., the sample size, the sampling interval ...
Hui-Rong Liu +2 more
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A New Control Scheme Always Better Than X-Bar Chart
Communications in Statistics - Theory and Methods, 2010A new control scheme is proposed by borrowing the idea of the Benjamini–Hochberg procedure for controlling the false discovery rate in multiple testing. It is shown theoretically that the proposed 2-span control scheme outperforms the Shewhart X-bar chart in terms of the average run length under any size of mean shifts. Some simulations are carried out
Lee, SH, Jun, CH
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A preliminary study on the double sampling X-bar chart with unknown parameters
2012 International Conference on Innovation Management and Technology Research, 2012The double sampling (DS) X chart is superior to the traditional Shewhart X chart in detecting small and moderate process mean shifts. In general, the DS X chart is typically designed under the assumption of known parameters. Nevertheless, the actual process parameters are rarely known in practice and are usually estimated from an in-control reference ...
Wei Lin Teoh, Michael B. C. Khoo
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