Box-Jenkins Manual Adjustment Chart: Bivariate Example

Article

Hunter, J. Stuart   (1998, ASQ)   Princeton University, Princeton, NJ

Annual Quality Congress, Philadelphia, PA    Vol. 52    No. 0
QICID: 10663    May 1998    pp. 61-69
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Article Abstract

The Box-Jenkins manual adjustment chart is an alternative to the Shewhart chart, though they should be used simultaneously. The Box-Jenkins chart not only monitors deviations but also contributes to process adjustment. A single variate numerical example demonstrates how historical data suggest the configuration of the adjustment equation, which then reduces process variability by about one-third. A bivariate example demonstrates handling of two responses and two controlling factors. This analysis investigates the role of autocorrelation in each response and the correlation between responses when comparing data taken before and after adjustment.

Keywords

Autocorrelation,Statistics,Process control,Correlation


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