David Lengacher


  • A powerful process improvement tool since the 1980s, Six Sigma has grown in popularity over recent years while less effective initiatives have faded away. Yet some still believe Six Sigma will ultimately share […]

  • There are several references stating linear regression is inappropriate in situations where Y is not normally distributed. Here is one from a little school called MIT. Just search for the phrase “dependent variable not normally distributed” and you’ll find dozens.…[Read more]

  • You can download R for free and using this tutorial, you can construct Generalized Linear Models (GLMs) in about 45 seconds. This set of models is used when your Y is not dist normally, or bound to positive values…something we often forget is a condition for linear regression. Try graphing your Y to ensure it’s not poisson dist. If it is,…[Read more]

  • I’m still interested in discussing interdisciplinary approaches to process improvement that cross traditional boundaries. I’ve update my website to more carefully hone in on efficiency and effectiveness. 9 years, 2 months ago

  • Accurate predictions, optimal decisions, and an explanation of root cause and its effects on a process are just a few of the many types of solutions managers are expected to deliver when complex problems appear. […]

  • If you are interested, please let me know. I’d like to guage potential attendance.