CHAPTER 7Correlation Tests
What you will learn in this chapter is how to discover the key process input variables (KPIVs) that may have caused a change in a process or product. To find them, we will be doing correlation tests.
In some Six Sigma classes, regression analysis is used to find correlations. A mathematical curve is fit to a set of data, and various techniques are used to measure how well the data fit this curve. The curve is then used to test for correlations.
These methods require a high degree of skill and generally are not friendly to those who are not doing this kind of analysis almost daily. Thankfully, most Six Sigma work can be done using the tools we have already covered, as long as we are willing to do some visual examination ...
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