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STATISTICS FOR SIX SIGMA MADE EASY!, Second Edition by Warren Brussee

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CHAPTER 9Simplified Gauge Verification

What you will learn in this chapter is how to determine gauge error and how to correct this error if it is excessive. When a problem surfaces, one of the first things that must be done is to get good data and measurements related to the problem. The issue of gauge accuracy, repeatability, and reproducibility applies everywhere that data measurements of variables are taken.

Before we use data, we must be satisfied that the data are accurate. One of the most frequent sources of error is the device used to measure the product or process. This device can be as simple as a ruler or as complex as a radiation sensor.

Data error can give us a false sense of security—we believe that the process is in control and ...

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