Rules of Three and Five
It’s been a while since I’ve written about statistics. So in this column, I will be looking at the rules of three and five. These are heuristics, or rules of thumb, that can help us out. They are associated with sample sizes.
Driverless Cars, Yes. Driverless Analysis... ?
Large Image Caption
While we may happily trust the technology of driverless cars,
it’s important to remember that control charts are never driverless.
Credit: SparkFun Electronics
Count Data: Easy As 1-2-3?
Large Image Caption
Where past data are concerned, baseball is good at redefining the operational definition and retrofitting the new definition
Many of you work in organizations that keep track of customer complaints. Have you ever thought of how they are recorded and tallied? What could possibly be wrong with this process: The customer brings a concern to your attention. Record it.
Inside Quality Digest Live for August 11, 2017
Large Image Caption
Credit: Georgia Tech
Our August 11, 2017, episode of QDL looked at the role of technology in after-market service, stairs that help you up, Fidget Cubes, and more.
Scientists at Work: Forecasting the Atlantic Hurricane Season
Large Image Caption
Hurricane Matthew approaching the east coast of Florida on Oct. 6, 2016
Cp and Cpk: Two Process Perspectives, One Process Reality
Large Image Caption
Cp and Cpk work together, like this image of the rabbit and duck.
It’s usually not a good idea to rely solely on a single statistic to draw conclusions about your process. Do that, and you could fall into the clutches of the “duck-rabbit” illusion shown below.
The Importer’s (Brief) Guide to Acceptance Sampling and Why It Matters
Large Image Caption
You can't always do 100-percent inspection
Autocorrelated Data
Large Image Caption
Credit: Richard Carter
Last month I mentioned that we can put autocorrelated data on a process behavior chart. But what is autocorrelated data and what does it tell us about our processes? This article will use examples to answer both of these questions.