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Check out the latest issue of our Stat-Teaser newsletter via this link. It leads with a detailing “Introducing Design-Expert® Software, v9, with Split-Plots!” and follows up with Stat-Ease Consultant Brooks Henderson's analysis on “Regressing the Rupee—Part II” that demonstrates two of DX9's new tools. Also see our heads-up on how to “Train Your Team on DOE with a Private On-Site Workshop”—an economical and convenient option for those of you whose organizations have a number of staff needing to be tooled up on design of experiments.
Newly-released version 9.0.3 of Design-Expert software is posted at this download site for free trial evaluation. To update older licensed versions of 9.0, simply download the update from within the program, or download the full installation and reinstall it. The release primarily provides maintenance of existing features. View the Read Me file for details on this update, installation tips, known ‘bugs,’ change history, and FAQs. PS. Reminder: If you want to receive notice when an update becomes available, go to Edit on the main menu of your program, select Preferences and, within the default General tab, turn on (if not already on by default) the “Check for updates on program start” option.
Original question from a Statistician/Quality Engineer: Answer from Stat-Ease Consultant Shari Kraber:
P.S. Learn more about this frequently-asked question by reading “Too many center points!”, Brooks Henderson & Pat Whitcomb, FAQ #4 of DOE FAQ Alert V10, No: 10 (Oct 2010) posted here. —Mark (Learn more about centerpoints in factorial designs by attending the two-day computer-intensive workshop Experiment Design Made Easy. Click on the title for a description of this class and link from this page to the course outline and schedule. Then, if you like, enroll online.)
Original Question from Albert Plant, Trainer and Consultant in Design of Experiments:
So in addition to randomization, you should also reset the factor levels—have I got that right? If so, when we look at the possibility of using split-plot designs to deal with hard-to-randomize designs, what about item 2 above, the resetting of the levels? Even if we use split plots to deal with the issue of randomization, should the factor levels still be reset in a split plot or does this design just deal with the randomization issue? In other words, are issues 1 and 2 essentially separate and, if possible, both should occur?” Answer: A split-plot structure makes this a lot trickier. The advice above still holds but for the hard-to-change (HTC) factor(s) the reset occurs between groups. For example, let’s say oven-temperature is the HTC; then groups of temperature occur in a random pattern, for example, group 1 low temperature–>group 2 high temperature–>group 3 high temperature–>group 4 low temperature… and so forth. As tempting as it would be just to keep on the same high temperature setting between groups 2 and 3, the experimenter must reset the temperature to get an accurate measure of error. (Learn more about split plots by attending the half-day computer-intensive workshop Factorial Split-Plot Designs for Hard-to-Change Factors (FSPD). Click on the title for a description of this class and link from this page to the course outline and schedule. Then, if you like, enroll online.)
(Sorry, due to the high cost of shipping, this offer applies only to residents of the United States and Canada.)
In this webinar titled “I really would rather not randomize my experiment!!!” (repeated three times for your scheduling convenience), Stat-Ease Consultant Wayne Adams discusses the pros and cons of restricting the randomization of an experiment. He provides practical advice on how to properly screen and characterize hard-to-change (HTC) factors (for example oven temperature) via factorial split-plot designs—a new feature provided by Version 9 of Design-Expert (DX9). Reserve your Webinar seat now by clicking one of the links below:
If this is your first Stat-Ease webinar, please review these suggestions on how to be prepared. If questions remain, direct them to our Communications Specialist, Karen Dulski, via [email protected]. *(To determine the time in your zone of the world, try using this link. We are based in Minneapolis, which appears on the city list that you must manipulate to calculate the time correctly.)
At the Technical Symposium of the Cleveland Coatings Society June 3rd I will present a 2-hour short-course on “Statistical Design of Experiments (DOE) for Optimal Formulation of Coatings”—see details here. PS. Do you need a speaker on DOE for a learning session within your company or technical society at regional, national, or even international levels? If so, contact me. It may not cost you anything if Stat-Ease has a consultant close by, or if a web conference will be suitable. However, for presentations involving travel, we appreciate reimbursement for travel expenses. In any case, it never hurts to ask Stat-Ease for a speaker on this topic.
All classes listed below will be held at the Stat-Ease training center in Minneapolis unless otherwise noted. If possible, enroll at least 4 weeks prior to the date so your place can be assured. Also, take advantage of a $400 discount when you take two complementary workshops that are offered on consecutive days.
*Take both EDME and RSM in the same week to earn $400 off the combined tuition!
** Take both MIX and MIX2 to earn $400 off the combined tuition! See this web page for complete schedule and site information on all Stat-Ease workshops open to the public. To enroll, scroll down to the workshop of your choice and click on it, or call Rachel 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 protected].
Mark Mark J. Anderson, PE, CQE PS. Quote for the month—An alarmingly high percentage of workers are calling in sick before or after weekends: —The Pointy Haired Boss from a Dilbert cartoon by Scott Adams. (According to this study on the role of extended weekends in sickness absenteeism it’s actually a lot worse than the Boss thinks—rates of sick leave for Mondays and Fridays being 1.4 and 1.9 times greater than those for other weekdays. —Mark) Trademarks: Stat-Ease, Design-Ease, Design-Expert and Statistics Made Easy are registered trademarks of
Stat-Ease, Inc. For breaking news from Stat-Ease go to this Twitter site. DOE FAQ Alert ©2014 Stat-Ease, Inc. |
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