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- Nelson_rules abstract "Nelson rules are a method in process control of determining if some measured variable is out of control (unpredictable versus consistent). Rules, for detecting "out-of-control" or non-random conditions were first postulated by Walter A. Shewhart in the 1920s. The Nelson rules were first published in the October 1984 issue of the Journal of Quality Technology in an article by Lloyd S Nelson.The rules are applied to a control chart on which the magnitude of some variable is plotted against time. The rules are based around the mean value and the standard deviation of the samples.The above eight rules apply to a chart of a variable value. A second chart, the moving range chart, can also used but only with rules 1, 2, 3 and 4. Such a chart plots a graph of the maximum value - minimum value of N adjacent points against the time sample of the range.An example moving range: if N = 3 and values are 1, 3, 5, 3, 3, 2, 4, 5 then the sets of adjacent points are (1,3,5) (3,5,3) (5,3,3) (3,3,2) (3,2,4) (2,4,5) resulting in moving range values of (5-1) (5-3) (5-3) (3-2) (4-2) (5-2) = 4, 2, 2, 1, 2, 3.Applying these rules indicates when a potential "out of control" situation has arisen. However there will always be some false alerts and the more rules applied the more will occur. For some processes, it may be beneficial to omit one or more rules. Equally there may be some missing alerts where some specific "out of control" situation is not detected. Empirically, the detection accuracy is good.".
- Nelson_rules thumbnail Rule_1_-_Control_Charts_for_Nelson_Rules.svg?width=300.
- Nelson_rules wikiPageExternalLink control-chart.html.
- Nelson_rules wikiPageExternalLink GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA310869.
- Nelson_rules wikiPageID "2015211".
- Nelson_rules wikiPageRevisionID "602898282".
- Nelson_rules hasPhotoCollection Nelson_rules.
- Nelson_rules subject Category:Quality_control_tools.
- Nelson_rules subject Category:Statistical_charts_and_diagrams.
- Nelson_rules subject Category:Technical_communication.
- Nelson_rules type Artifact100021939.
- Nelson_rules type Implement103563967.
- Nelson_rules type Instrumentality103575240.
- Nelson_rules type Object100002684.
- Nelson_rules type PhysicalEntity100001930.
- Nelson_rules type QualityControlTools.
- Nelson_rules type Tool104451818.
- Nelson_rules type Whole100003553.
- Nelson_rules comment "Nelson rules are a method in process control of determining if some measured variable is out of control (unpredictable versus consistent). Rules, for detecting "out-of-control" or non-random conditions were first postulated by Walter A. Shewhart in the 1920s.".
- Nelson_rules label "Nelson rules".
- Nelson_rules sameAs Aturan_Nelson.
- Nelson_rules sameAs m.06f5n5.
- Nelson_rules sameAs Q12472814.
- Nelson_rules sameAs Q12472814.
- Nelson_rules sameAs Nelson_rules.
- Nelson_rules wasDerivedFrom Nelson_rules?oldid=602898282.
- Nelson_rules depiction Rule_1_-_Control_Charts_for_Nelson_Rules.svg.
- Nelson_rules isPrimaryTopicOf Nelson_rules.
