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Title: Practical Problems With Correlated Measurements
Author: Philip Stein
Source: 2000 Measurement Science Conference
Year Published: 2000
Abstract: Many, if not most industrial measurements are made for the purpose of inspection, that is acceptance or rejection of product. When a product is exposed to a battery (2) of such tests, failure of any one test will fail the product. If those measurements are correlated, though, this common procedure will yield the wrong answer. This could very easily become expensive as acceptable product is rejected due to incorrect math. Mike Sharps paper, one of the others in this session, refers to an inspection system for TV picture tube faceplates. In this application, as with many others, a number of measurements of product quality is made, often a large number, and the unit of product is rejected (declared to be a defective) if any of those measurements are outside specified limits or tolerances. This is such a common practice as to be invisible, like air.

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