Abstract
From the 1930s, literature on SPC schemes have been “captured” by the Shewhart paradigm of normality, independence and homogeneous variance. When in fact, the problems facing today’s industries are more inconsistent than those faced by Dr. Shewhart in the 1930s. As a result of the advances in machine and sensor technology, process data can often be collected on-line. In this situation, the process observations that result from data collection activities will frequently not be independent, but autocorrelated. Autocorrelation has a significant impact on a statistical control chart: the process may not exhibit a state of statistical control when in fact, it is in control. As the prevalence of this type of data is expected to increase in industry, so does the need to control and monitor it. A second consequence of this technology shift is that many industries now operate in a data-rich environment. They have the ability to gather many observations on several quality characteristics in a short period of time. This gives rise to a situation probably not envisioned by Shewhart in the 1930s: too much process data and too little information about the process. This domain is ripe for the methods of data mining and multivariate quality control. This paper develops a multivariate statistical process monitoring scheme for a continuous process: the production of mono-filament nylon fibers. The data is abundant (over 80 process and quality variables) and has varying degrees of serial correlation. Various data mining methodologies are used to determine the driving variables which affect the response variable, spin breaks.
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Mastrangelo, C.M., Porter, J.M., Baxley, R.V. (2001). Multivariate Process Monitoring for Nylon Fiber Production. In: Lenz, HJ., Wilrich, PT. (eds) Frontiers in Statistical Quality Control 6. Frontiers in Statistical Quality Control, vol 6. Physica, Heidelberg. https://doi.org/10.1007/978-3-642-57590-7_14
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DOI: https://doi.org/10.1007/978-3-642-57590-7_14
Publisher Name: Physica, Heidelberg
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