Donald J. Wheeler
Now we come to the sixth way to use a process behavior chart. Here we are going to look at how one group of workers used their average and range chart to improve their process. Their part had only...
Donald J. Wheeler
While we may tweak things in production, we rarely get permission to conduct formal experiments with an operating production line. Production’s job is to make product, whereas experiments are what...
Donald J. Wheeler
The question “Is this batch like the others?” is asked all over the world on a daily basis. It turns out that the process behavior chart provides a very effective answer for questions about the...
Donald J. Wheeler
Having described the report card chart and the process monitor chart in previous columns, we now turn to a third way that people use process behavior charts—the process trial chart. Here the...
Donald J. Wheeler
The simple process behavior chart may be used in several ways. Many articles and some textbooks describe process behavior charts as tools for process monitoring. In Norway the words used for SPC...
Donald J. Wheeler
The simple process behavior chart can be used in many different ways. Since report card data are common in all types of businesses, the report card chart is often the first chart that people create...
Donald J. Wheeler
Experimental designs that result in orthogonal data structures allow us to get the most out of both our analysis and our research budget. As a result, designed experiments have been used for...
Donald J. Wheeler
Context involves both the background for the data and how the data behave. This behavior of the data is most easily seen by using two complementary graphs—the running record and the histogram. Here I...
Donald J. Wheeler
Here we look at a simple example to discover the commonalties of various data analysis techniques widely used in industry today. Careful consideration of the following may result in insights that...
Donald J. Wheeler
The Levey-Jennings chart was created in the 1950s to answer questions about the quality and consistency of measurement systems in the chemical and process industries. This column will illustrate...
