Tag Archives: measurement systems analysis

You Can’t Always Tell by Looking

Our Green Belt course includes an exercise where students create a histogram from a file of 100 data values.  Here is the histogram of the data, with a normal probability distribution curve superimposed: Students are not asked to comment on the result, but most are unable to resist doing so.  The majority who do comment […]

Evaluating Gage Bias and Linearity

In an earlier article in this series, I introduced some basic issues in measurement systems analysis such as granularity, accuracy, reproducibility, repeatability, stability and linearity.  In this article we will explore in more detail how to evaluate the performance of a measurement system with respect to bias and linearity. Gage bias examines the difference between […]