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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 ...
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.
Date/Time Thumbnail Dimensions User Comment; current: 01:00, 7 October 2009: 230 × 200 (46 KB): GMcGlinn~commonswiki: cleared of svg black block disease : 00:28, 7 October 2009
"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.
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.
The Hawthorne Works was a large factory complex of the Western Electric Company in Cicero, Illinois. In addition to industrial plants, several on-site community amenities were provided to workers. Named for the original name of what became Cicero, Hawthorne, it opened in 1905 and operated until 1983.
Unwritten Law was formed in Poway, California by Wade Youman back in the mid 1980s when he was twelve years old. [3] The band's first lineup was Youman on drums, Chris Mussey on vocals, Matt Rathje on guitar, and Craig Winters on bass, Youman described the early incarnations of the group as "kind of Punk, Clashy, and Bauhausy", [4] [5] A number of players came and went throughout the early ...