Marcellus, Richard L.
M.S. (Master of Science)
Department of Industrial Engineering
Production control--Charts; diagrams; etc; Quality control--Charts; diagrams; etc
This study designs an exponentially weighted moving average residual (EWMAR) chart for autocorrelated processes. The first order autoregressive (AR(1)) process and the first order moving average (MA(1)) process are examined. The performance of the EWMAR chart is compared with that of Alwan's Shewhart residual (ASRC) chart and that of the exponentially weighted moving average (EWMA) chart based on the average run length. A cost model of the EWMAR chart is derived and a numerical analysis is performed based on this model. The results show that when autocorrelation is present, using the EWMAR chart can improve quality control performance. The EWMAR chart outperforms the ASRC chart for a small shift in the process mean and does not lose much for a large shift in the process mean. The EWMAR chart outperforms the EWMA chart for an AR(1) process.
Chen, Jiakang, "A study of the performance of the exponentially weighted moving average residual chart" (1995). Graduate Research Theses & Dissertations. 755.
v, 81 pages
Northern Illinois University
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Includes bibliographical references (pages -53)