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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.
The Westgard rules are a set of statistical patterns, each being unlikely to occur by random variability, thereby raising a suspicion of faulty accuracy or precision of the measurement system. They are used for laboratory quality control, in "runs" consisting of measurements of multiple samples. They are a set of modified Western Electric rules ...
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Intoxication and blood alcohol level chart. The National Highway Safety Administration (NHTSA) uses BAC standard drink measurements of: 12-ounce beer. 5-ounce table wine. 1.5-ounce 80-proof liquor ...
pain. swelling. skin damage. ulcers. Staging helps doctors pinpoint the progression of your CVI. It can be used to figure out the best treatments for you and your outlook. CVI will be staged when ...
The stage helps your doctor choose the best course of treatment for you. Stage I. The cancer is growing in your prostate but hasn’t spread beyond it. In most cases, the doctor can’t feel the ...
A dull ache or cramping in the legs. Tingling or burning in your legs. Pain that gets worse when you stand or gets better when you put your legs up. Itchiness. Varicose veins. Chronic venous ...
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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