EIA 591 : 1992(R2002)
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ASSESSMENT OF QUALITY LEVELS IN PPM USING VARIABLES TEST DATA
12-01-2013
The traditional approach to measuring levels of nonconformance using attribute data, whether the results are stated in percent or Part Per Million (PPM), becomes more burdensome as the nonconformance levels approach zero. The quantities required to establish a data base for an acceptable confidence level may be in the hundreds of thousands, which also makes it impracticable for a user to verify these quality levels at an Incoming Inspection Facility.
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