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- Q12472814 subject Q7014336.
- Q12472814 subject Q8614106.
- Q12472814 subject Q8817192.
- Q12472814 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 on 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 be 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.".
- Q12472814 thumbnail Rule_1_-_Control_Charts_for_Nelson_Rules.svg?width=300.
- Q12472814 wikiPageExternalLink control-chart.html.
- Q12472814 wikiPageExternalLink GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=ADA310869.
- Q12472814 wikiPageWikiLink Q11306265.
- Q12472814 wikiPageWikiLink Q1165839.
- Q12472814 wikiPageWikiLink Q1356717.
- Q12472814 wikiPageWikiLink Q1369242.
- Q12472814 wikiPageWikiLink Q159375.
- Q12472814 wikiPageWikiLink Q1649571.
- Q12472814 wikiPageWikiLink Q196372.
- Q12472814 wikiPageWikiLink Q272035.
- Q12472814 wikiPageWikiLink Q2796622.
- Q12472814 wikiPageWikiLink Q280951.
- Q12472814 wikiPageWikiLink Q462232.
- Q12472814 wikiPageWikiLink Q4745039.
- Q12472814 wikiPageWikiLink Q50701.
- Q12472814 wikiPageWikiLink Q620784.
- Q12472814 wikiPageWikiLink Q7014336.
- Q12472814 wikiPageWikiLink Q7106411.
- Q12472814 wikiPageWikiLink Q7987806.
- Q12472814 wikiPageWikiLink Q8614106.
- Q12472814 wikiPageWikiLink Q8817192.
- Q12472814 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.".
- Q12472814 label "Nelson rules".
- Q12472814 depiction Rule_1_-_Control_Charts_for_Nelson_Rules.svg.