Comparison of Univariate Control Charts with Transformation in Variability Measure
DOI:
https://doi.org/10.18041/1909-2458/ingeniare.13.623Keywords:
Measure of variability, Transformation, Sensitivity, Simulation R, ARL and Alarm signalsAbstract
Monitoring of the variability of a quality feature using univariate control charts in a production processiscritical to detect signifi cant changes in order to allow the engineer to control the condition and behavior of thatfeature. Alwan [1] proposes the study to improve the sensitivity in univariate control charts by transforming the measure of variability transformation taking the standard deviation for the logarithmic EWMA chartsproposed by Crowder [2], fi nding an improvement in sensitivity to small changes in variability. This sensitivity improves in HV CUSUM proposal which applies a transformation to the standard deviation of three parameters [3] fi rst proposed by Castagliola [3].
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References
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