Some Comments Regarding the Synthetic Chart |
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| Authors: | Marcela A G Machado Antonio F B Costa |
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| Institution: | 1. Department of Production, S?o Paulo State University, Guaratinguetá, S?o Paulo, Brazilmarcela@feg.unesp.br;3. Department of Production, S?o Paulo State University, Guaratinguetá, S?o Paulo, Brazil |
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| Abstract: | The steady-state average run length (ARL) is a function of the in-control probabilities of being in each nonabsorbing state. Davis and Woodall (2002) tabulated values that are significantly smaller than the steady-state ARLs, because they used the out-of-control probabilities. The synthetic chart signals when a second sample point falls beyond the control limits, no matter whether one of them falls above the centerline and the other falls below it. The side-sensitive version of the synthetic chart does not signal when the points beyond the control limits are on opposite sides. With this rule, the chart detects mean changes more quickly. |
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| Keywords: | Shewhart chart Side-sensitive Chart Steady-state average run length |
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