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The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.
They are a set of modified Western Electric rules, developed by James Westgard and provided in his books and seminars on quality control. [1] 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 ...
The Western Electric rules; The Wheeler rules (equivalent to the Western Electric zone tests [16]) The Nelson rules; There has been particular controversy as to how long a run of observations, all on the same side of the centre line, should count as a signal, with 6, 7, 8 and 9 all being advocated by various writers.
Date/Time Thumbnail Dimensions User Comment; current: 01:02, 7 October 2009: 230 × 200 (78 KB): GMcGlinn~commonswiki: cleared of svg black block disease : 00:32, 7 October 2009
It seems like every web page I visit that mentions Western Electric rules, says that rule 4 is violated if just eight consecutive points fall on the same side of the centerline.--216.254.190.174 13:09, 3 July 2009 (UTC)
Western Electric Co., Inc. was an American electrical engineering and manufacturing company that operated from 1869 to 1996. A subsidiary of the AT&T Corporation for most of its lifespan, Western Electric was the primary manufacturer, supplier, and purchasing agent for all telephone equipment for the Bell System from 1881 until 1984, when the Bell System was dismantled.
Electrical recording was developed by Western Electric, although a primitive electrical process was developed by Orlando R. Marsh, owner and founder of Autograph Records. Western Electric demonstrated their process to the two leading recording companies, Victor and Columbia , who were initially unwilling to adopt it because they thought it ...
In the early 1920s, Western Electric was developing both sound-on-film and sound-on-disc systems, aided by the purchase of Lee De Forest's Audion amplifier tube in 1913, consequent advances in public address systems, and the first practical condenser microphone, which Western Electric engineer E.C. Wente had created in 1916 and greatly improved in 1922.