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The Nelson rules were first published in the October 1984 issue of the Journal of Quality Technology in an article by Lloyd S Nelson. [2] The rules are applied to a control chart on which the magnitude of some variable is plotted against time. The rules are based on the mean value and the standard deviation of the samples.
The Nelson rules; There has been particular controversy as to how long a run of observations, all on the same side of the centre line, should count as a signal, with 6, 7, 8 and 9 all being advocated by various writers. The most important principle for choosing a set of rules is that the choice be made before the data is inspected.
The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.
The United Nations Standard Minimum Rules for the Treatment of Prisoners were adopted by the United Nations General Assembly on 17 December 2015 after a five-year revision process. [1] They are known as the Mandela Rules in honor of the former South African President, Nelson Mandela. The Mandela Rules are composed of 122 "rules".
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Nelson rules, in control theory, identify when a measured variable is out of control Topics referred to by the same term This disambiguation page lists articles associated with the title Out of Control .
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Rules 5 and 6 aren't entirely clear. For example, consider this sequence of data where +1 represents a point more than 2 sigma above the mean. 0 +1 +1 0 +1. It is clear that applying rule 5 at point 3, 2 of the last 3 points are beyond the 2 sigma limit and so the rule is violated.