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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.
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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 ...
"7.8 per thousand" = 1/128 = 1/2 7. From Statistcal Quality Control Handbook, 2nd edition, 10th printing May 1984, copyright 1956 Western Electric: on page 181 the rule (3)is clearly stated as "eight points in succession on one side of the centerline". The stated probability is 0.5^8 = 0.0039.
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.
1,2,3, a band from Pittsburgh later reformed as Animal Scream 1-2-3, a band from Edinburgh later known as Clouds One, Two, Three, a 1980s electronic disco group produced by Bobby Orlando
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 ...
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.