Adapting EWMA Control Charts for Batch-Correlated Data |
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Authors: | Stephen M. Scariano Jaimie L. Hebert |
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Affiliation: | a Old South Distributing Company, Inc., Kenner, Louisiana, USAb Sam Houston State University, Huntsville, Texas, USA |
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Abstract: | Batch production is common in the chemical and process industries. This article demonstrates how EWMA charts should be modified to account for substantial batch-to-batch variation. A batch-correlation model is considered, and methods of estimation and hypothesis testing for the batch-correlation coefficient are developed. This discussion is most appealing for production processes in which items are processed in batches but are related within batch. |
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Keywords: | EWMA control charts Dependent data Batch-correlation |
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