A multivariate extension of the exponentially weighted moving average (EWMA) control chart is presented, and guidelines given for designing this easy-to-implement multivariate procedure. A comparison ...

The extent to which products meet specifications needs to be systematically monitored in a production process. Product quality will typically be defined by two quantities: deviations from stated ...

All Shewhart charts have the following characteristics: Each point represents a summary statistic computed from a sample of measurements of a quality characteristic. For example, the summary statistic ...

Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 41, No. 1 (1992), pp. 147-158 (12 pages) Acceptance control charts establish control limits based on specification limits ...