Control charts are widely accepted and used in manufacturing industry. However, surprisingly often the data sets that they are used to analyse come from markedly non-normal populations. A modification of the control charts based on medians is proposed which overcomes non-normality problems. These median charts keep the traditional format and have reasonable power. The format is vital, for if the charts are to be used on the shop-floor then they must be acceptable and as we mimic accepted practice our proposals fulfil this requirement.
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Janacek et al. (1997) studied this question.
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