Here's another set of frequently asked questions (FAQs) about doing design of experiments (DOE), plus alerts to timely information and free software updates. If you missed the previous DOE FAQ Alert, please click on the links at the bottom of this page. If you have a question that needs answering, click the Search tab and enter the key words. This finds not only answers from previous Alerts, but also other documents posted to the Stat-Ease web site.
Feel free to forward this newsletter to your colleagues. They can subscribe by going to http://www.statease.com/doealertreg.html. If this newsletter prompts you to ask your own questions about DOE, please address them via mail to:StatHelp@StatEase.com.
For an assortment of appetizers to get this Alert off to a good start, see these new blogs at http://statsmadeeasy.net:
1. Newsletter Alert: September issue of the Stat-Teaser offers an intoxicating article on how to mix a tasty beer cocktail
Many of you will soon receive a printed copy of the latest Stat-Teaser, but others, by choice or because you reside outside of North America, will get your only view of the September issue at http://www.statease.com/news/news0709.pdf. It features an article by me titled "Mixture Design Brews Up New Beer Cocktail—Black & Blue Moon," which details how I made use of mixture design for the optimal formulation* of three distinct beers.
This issue of the Stat-Teaser also provides a primer on power titled "No More Under-Sized Factorials via Shari's Favorite New Tool." It shows how to make use of new features in version 7.1 of Stat-Ease software. Check this out via the newly-revised online tour of the Design-Expert® program posted at http://www.statease.com/soft_ftp.html along with a free trial of the software itself—fully-functional for 45 days of use. The last page of the newsletter features the new second edition of "DOE Simplified." See http://www.statease.com/doe_simp.html for details on this fun, but very informative primer on DOE. Link from there to purchase it on line.
PS. The October 3, 2007, issue of ASQ Weekly features "DOE Simplified" as their Book of the Week. :)
*(Learn more about mixture design by attending the three-day computer-intensive workshop "Mixture Design for Optimal Formulations." For a complete description of this class, see http://www.statease.com/clas_mix.html. Link from this page to the course outline and schedule. Then, if you like, enroll online.)
2. FAQ: Why no red line on diagnostic plot for leverage?
PS. For more detail on leverage, see this year's May DOE FAQ Alert, FAQ #1 at http://www.statease.com/news/faqalert7-5.html and follow the links provided afterward.
(Learn more about leverage by attending the three-day computer-intensive workshop "Experiment Design Made Easy." See http://www.statease.com/clas_edme.html for a description of this class and then link from this page to the course outline and schedule. Then, if you like, enroll online.)
3. Upcoming Webinar: Sizing RSM and Mixture Designs for Adequate Precision via use of Fraction of Design Space (FDS) Plots
You are invited to attend a free web conference by Stat-Ease on "Sizing RSM and Mixture Designs for Adequate Precision via use of Fraction of Design Space (FDS) Plots" at 8 AM Central USA Time on
Unique to this 'webinar' will be demonstrations of upgraded FDS features in our latest revision of
Pat addressed this concern in his MINI PAPER (abridged by me) on "Interpreting Power in Mixture DOE—Simplified"—see http://www.asqstatdiv.org/documents/newsletters/Fall06StatDiv.pdf . Now, via this webinar, Pat provides a possible remedy.
4. Free books (US/Canada only): Enter drawing for 2 copies of Box & Drapers' "Empirical Model-Building and Response Surfaces" and 2 signed "RSM Simplified" primers by Anderson & Whitcomb
(Sorry, due to the high cost of shipping, this offer applies only to residents of the United States and Canada.)
Simply reply to this e-mail by October 26 if you'd like a free copy of Box and Drapers' classic statistical text "Empirical Model-Building and Response Surfaces." Originally published in 1987 (John Wiley and Sons, New York), this book is a classic in the field of response surface methods (RSM) for process optimization. However, for workshops on this topic,* Stat-Ease now uses Myers and Montgomerys' "Response Surface Methods." Furthermore, in the recently-published "Response Surfaces, Mixtures and Ridge Analysis," George E. P. Box, Norman R. Draper offer much more than their previous RSM textbook—857 pages worth!
A drawing will also be held for two autographed copies of "RSM Simplified: Optimizing Processes Using Response Surface Methods for Design of Experiments." These two books will be signed by the authors (myself and Stat-Ease consultant Patrick Whitcomb). For more information on this soft cover 'how-to' primer, see http://www.statease.com/rsm_simplified.html.
In your e-mail, feel free to specify which of these two titles you would like. (Reminder: If you reside outside the US or Canada, you are NOT eligible for the drawing because it costs too much to ship the books.) For a complete list of books offered for sale by Stat-Ease, go to its e-commerce site at http://www.statease.com/prodbook.html.
*(Learn more about RSM by attending the three-day computer-intensive workshop "Response Surface Methods for Process Optimization." See http://www.statease.com/clas_rsm.html for a complete description. Link from this page to the course outline and schedule. Then, if you like, enroll online.)
5. Info Alert: "Adhesives & Sealants Industry" DOE case study
The latest issue of "Adhesives & Sealants Industry" features a case study on a designed experiment that significantly reduced downtime in a masking-tape production process. It investigated five potential causes in a fractional two-level factorial. The results demonstrated that the line would run without problems by simply compensating for temperature changes. See this story at http://www.statease.com/articles.html, along with many other helpful case-studies, as well as 'how-to' and statistical publications on design of experiments.
6. Event alert: Several talks and exhibits the next 4 weeks!
At the 51st Fall Technical Conference (FTC) in Jacksonville, Florida on October 11-12 Pat Whitcomb will talk about "Graphical Selection of Effects in General Factorials." I will make an appearance as the presenter of Jeff Hybarger's presentation on "The Ten Most Common Designed Experiment Mistakes." (He couldn't make it.) Pat and I will also man a tabletop display for Stat-Ease. See http://www.asqstatdiv.org/ftc.htm for all the details on FTC.
7. Workshop alert: See when and where to learn about DOE
Here is the Fall lineup of our DOE classes:
—Experiment Design Made Easy (EDME) (Detailed at http://www.statease.com/clas_edme.html)
—Response Surface Methods for Process Optimization (RSM) (http://www.statease.com/clas_rsm.html)
—DOE for DFSS: Variation by Design
See http://www.statease.com/clas_pub.html for complete schedule and site information on all Stat-Ease workshops open to the public. To enroll, click the "register online" link on our web site or call Elicia at 612.746.2038. If spots remain available, bring along several colleagues and take advantage of quantity discounts in tuition. Or, consider bringing in an expert from Stat-Ease to teach a private class at your site.*
*Once you achieve a critical mass of about 6 students, it becomes very economical to sponsor a private workshop, which is most convenient and effective for your staff. For a quote, e-mail email@example.com.
I hope you learned something from this issue. Address your general questions and comments to me at: Mark@StatEase.com.
Mark J. Anderson, PE, CQE
PS. Quotes for the month—Scientists crave unpredictability according to theoretical physicist Freeman Dyson:
Acknowledgements to contributors:
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