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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 last chart is the most important for current investors to watch. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us ...
Levey–Jennings chart – redirects to Laboratory quality control; Lévy's convergence theorem; Lévy's continuity theorem; Lévy arcsine law; Lévy distribution; Lévy flight; Lévy process; Lewontin's Fallacy; Lexis diagram; Lexis ratio; Lies, damned lies, and statistics; Life expectancy; Life table; Lift (data mining) Likelihood function ...