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An example of a Levey–Jennings chart with upper and lower limits of one and two times the standard deviation. A Levey–Jennings chart is a graph that quality control data is plotted on to give a visual indication whether a laboratory test is working well. The distance from the mean is measured in standard deviations.
They are plotted on Levey–Jennings charts, wherein the X-axis shows each individual sample, and the Y-axis shows how much each one differs from the mean in terms of standard deviation (SD). The rules are: [2]
Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.
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The Levey-Jennings chart differs from the Shewhart Individuals control chart in the way sigma is estimated. The Levey-Jennings chart uses the long-term (i.e., population) estimate of sigma whereas the Shewhart chart uses the short-term (i.e., within the rational subgroup) estimate. John 72.153.169.233 21:41, 30 November 2009 (UTC)
Levey–Jennings chart – redirects to Laboratory quality control; Lévy's convergence theorem; ... Weibull chart – redirects to Weibull distribution;
Jennings is an American rapper from Nashville and is the grandson of instrumental rock guitarist Duane Eddy and country musician Jessi Colter, the step-grandson of Waylon Jennings, and the nephew ...
Yup. I agree with that. Levy Jennings charts are used only in Laboratory QC situations. —Preceding unsigned comment added by 63.133.130.174 20:58, 12 November 2009 (UTC) Two good reasons for keeping separate are the inclusion of the chart article in Category:statistical charts and diagrams