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Showing 1 to 6 of 6 for “"Shewhart charts"”.
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Variable sampling in multiparameter Shewhart charts
This dissertation deals with the use of Shewhart control charts, modified to have variable sampling intervals, to simultaneously monitor a set of parameters. Fixed sampling interval control charts are modified to utilize sampling intervals that vary depending on what is being observed from the …
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The development of performance measures and diagnostic procedures for X(bar) and S(2) charts
… statistical process control methods, such as Shewhart charts, are responsible for the observation, evaluation, and diagnosis of processes to aid in the decision and implementation of corrective action.
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Monitoring for a Shift in a Process Covariance Matrix Using the Generalized Variance
The commonly recommended charts for monitoring the mean vector are affected by a shift in the covariance matrix. As in the univariate case, a chart for monitoring for a change in the covariance matrix should be examined first before examining the chart used to monitor for a change in the mean …
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Control of a semiconductor dry etch process using variation and correlation analyses
… the plasma ashing process. By plotting control charts on past data, outlier data points are detected using Analog's current monitoring system. Further, irregularities in the process that would not have been detected using traditional x-bar Shewhart charts are detected by monitoring …
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Surveillance of Negative Binomial and Bernoulli Processes
… item, p, be extremely small. Traditional Shewhart charts such as the p-chart, are not reliable for monitoring this type of process. A comprehensive literature review of control chart procedures for this type of process is given. The equivalence between two cumulative sum (CUSUM) charts, …
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On Development and Performance Evaluation of Some Biosurveillance Methods
This study examines three applications of control charts used for monitoring syndromic data with different characteristics. The first part develops a seasonal autoregressive integrated moving average (SARIMA) based surveillance chart, and compares it with the CDC Early Aberration Reporting System …