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The LR-Chart: An Alternative to the MR-Chart

Summary: [This abstract is based on the author's abstract.]The regression smoother LOWESS is used to estimate the mean level in the design of an individuals chart on which the deviations from the mean estimate are also plotted. The chart gives an estimator of the process variance from stable measurements on a par with the estimator based on the sample standard deviation. When applied to mean-shifted measurements, the estimator frequently has a lower mean squared-error than a moving range based estimator.

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  • Topics: Data Quality
  • Keywords: Data smoothing,Estimation,Variance (statistics),Robust design,Moving range control charts
  • Author: Braun, W.J.
  • Journal: Quality Engineering