Author

John Sall
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Co-Founder and Executive Vice President, SAS

John Sall leads the JMP business unit at SAS and remains the chief architect of JMP statistical discovery software. JMP has been a part of SAS since the first version of JMP was launched in 1989, bringing interactive data visualization and analysis to the desktop.

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Not Really an $11 Trillion Hole

The front page of the Wall Street Journal on March 13 highlighted an "$11 Trillion Hole" and said "Americans See 18% of Wealth Vanish." I looked at the chart, and the 2008 number indeed looked as if it had fallen off a cliff. But then I looked at the rest

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Optimal Design of the Choice Experiment

My previous blog post covered issues in the design of a choice experiment for laptop computers. The goal was to model the trade-offs among features and price. In this post, I'll show how to design a choice experiment. The Choice Design feature, which you access from the DOE menu in

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Choice Experimental Designs Are Different

Laptop vendors need to know which features are valued in a laptop and how much customers are willing to pay for them. Manufacturers could learn this through a market research technique know as a choice experiment. This post covers the elements of experimental design for choice experiments using JMP 8.

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Experiments on Experiments, Models of Models

(NOTE: This is part three of three-part series on stochastic optimization.) Over the last two weeks, I introduced robust process engineering and stochastic optimization – the effort to achieve good product in the face of variation among the factors. Last week, I gave a cooking example. This week, I present

3
Cooking Optimization: Should You Cook Hot and Fast, or Warm and Slow?

(NOTE: This is part two of a three-part series on stochastic optimization.) In my previous post, I introduced stochastic optimization. In this post, I show a real example. This example was reported in the classic text by George Box and Norman Draper: Empirical Model-Building and Response Surfaces (page 32), and

2
The Challenge of Optimizing Products and Processes

(NOTE: This is part one of a three-part series on stochastic optimization.) To get to the top of a hill, you just keep going up. However, hills can have subpeaks, so sometimes you have to hunt around to keep going up. But going up is still the basic idea. This

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JMP's Director of Statistical R&D Honored as ASA Fellow

Brad Jones, JMP's Director of Statistical R&D, has been elected a Fellow of the American Statistical Association, the most prominent professional statistical society in the US. This honor recognizes "outstanding professional contributions to and leadership in the field of statistical science." Brad has a career-long passion for the field of

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Dino Nuggets and Snotties versus Simpson's Paradox

Last week's news had the story from NC State University that dinosaurs probably tasted like chicken, and this week's Discovery Planet episode brought us the vivid scenes of the living snottie cave ceilings of Cueva de Villa Luz, an acid fuming cavern in the Tabasco state of Mexico. So how