Abstract
The utility of many standard control charts is closely related to the sensitivity of the mean and range to a few extreme observations. Such sensitivity is undesirable, however, when designing the charts. One way to minimize the effect of extreme data in determining control chart limits is to use robust statistics. Langenberg and Iglewicz (1986) discuss one approach and provide a table of factors to estimate untrimmed ranges from trimmed ranges. Herein, a similar table provides values categorized by the number of observations trimmed, rather than by the proportion trimmed. Another table for estimating untrimmed standard deviations from trimmed standard deviations is also presented
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