Case Studies/Articles

Using Quantum XL to Define Multiple Inputs Simultaneously

In 1927, Babe Ruth hit 60 home runs, setting the single season record that would stand for more than three decades. Thirty four years later, in 1961, Roger Maris surpassed Babe Ruth with 61 home runs.   read full article

Design for Lean Six Sigma Deployment Book

Thinking about rolling out a Design for Lean Six Sigma program to your product development organization?  Not sure where to start or how to help ensure a successful deployment?  A recently published book may give you insight into a successful DFSS deployment.    read full article

Quantum XL 2009 New Features

DFSS XL 2008 has been renamed Quantum XL 2009. It is in final beta and should launch in the Q1 2009. The new version includes numerous new features including more flexible model building, latitude plots, percent contribution plots, support for 13 distributions, and much more.   read full article

Scatter Plots and Simple Linear Regression

A scatter diagram is an extremely simple statistical tool used to show a relationship between two variables. It is often combined with a simple linear regression line used to fit a model between the two variables. To illustrate this, I collected some data on a recent trip to the La Brea Tar Pits.  read full article

Understanding Binomial Confidence Intervals

The Binomial Distribution is commonly used in statistics in a variety of applications. There are several ways to estimate the Binomial Confidence Interval (CI); in this article we will focus on the Normal Approximation Method and the Clopper-Pearson Method. read full article

Introduction to FMEA on a Ski-Resort Gondola Lift

I was suspended approximately 200 feet above a ravine when the thought occurred to me. Had the engineer(s) of the Gondola Lift that my family and I were currently occupying used Failure Mode and Effects Analysis (FMEA) when designing the lift?  read full article

Roger Clemens, Barry Bonds, Performance-Enhancing Drugs, and a Hypothesis Test

Athletes and their purported use of performance-enhancing drugs have dominated the sporting news in the last few months. The controversy seems to be particularly heated in the sport of baseball, with the Mitchell Report naming many famous players. Of particular interest is the accusation by Brian McNamee that Roger Clemens used performance-enhancing drugs to increase his performance. read full article

Calculating Type I Probability - Article covering the math details behind the article Roger Clemens and a Hypothesis Test.