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If this newsletter prompts you to ask your own questions about DOE, please address them via e-mail to: [email protected]. Topics in the body text of this DOE FAQ Alert are headlined below:
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PS. Quote for the month: The downside of statistical modeling—using it to entice more e-commerce from gift buyers this holiday season—one consumer's poetic (emphasis on Poe) pushback. |
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Original Question: From A Coatings Technologist: Answer: From Stat-Ease Consultant Shari Kraber: (Learn more about p-values 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.) 2: FAQ: Which is the best response surface methods (RSM) design: Central Composite, or Box-Behnken? Original Question:
From a Material Science Engineer: Answer: From Stat-Ease Consultant Brooks Henderson: Whether you use a two-level factorial or an RSM design depends
on your situation. If you still need to identify which factors
have the biggest influence on the response and this is your first
DOE on the process, you would most likely use a factorial design. If you already have a good idea as to what factors affect the
response the most and what region the optimum is likely to be in,
you can use an RSM design. PS. I am partial to face-centered central composite designs (FCD). This reduces the number of levels to 3 for each factor (versus 5 for the standard CCD). A Box-Behnken design (BBD) also features 3 levels only, but it does not provide the extreme vertices of the cuboidal spaces. (I tend to be a bit aggressive in my explorations!). For everything you ever wanted to know about CCDs (vs BBD), refer to "RSM Simplified"—detailed here and from there available for purchase. PPS. Stat-Ease Consultant Pat Whitcomb warns that for more than 5 factors the FCD exhibits high variance inflation factors (VIFs) relative to the BBD. For these larger designs, a good compromise between FCD and the standard CCD is provided by the "practical alpha" choice in Design-Expert. The alpha value is the 4th root of the number of factors. This has been shown to produce axial values that can practically be run, and yet the design still has sound statistical properties. (Learn more about CCDs by attending the two-day computer-intensive workshop "Response Surface Methods for Process
Optimization." Click on the title for a
complete description. Link from this page to the course outline
and schedule. Then, if you like, enroll online.) 3: Expert-FAQ: How do the coded-model coefficients relate to the effects from a minimum-run resolution V (MR5) design? Original Question: From a PhD in Industrial Engineering and Operations Research: Answer: From Stat-Ease Consultant Wayne Adams: (Learn more about MR 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.)
4: Info alert: Whirley Pop DOE Part II
Design Product News published follow up studies by Stat-Ease Consultant Brooks Henderson for optimization for Whirley-Pop™ popcorn. See via this link how he augmented his original factorial design to a response surface methods (RSM) design. Brooks concludes by saying that "After these experiments, I'm sure my wife and I will never look upon our Whirley Pop popper quite the same way again." Read into that what you like. ;) Whirley-Pop™ is a trademark of Wabash Valley Farms.
5: Webinar alert: DOE Made Easy and More Powerful via
Design-Expert Software, Part 3—Mixture Design for Optimal
Formulation
Keeping it simple and making it fun, Stat-Ease is introducing an
array of statistical methods for design of experiments (DOE) made
easy and more powerful via version 8 of Design-Expert software: *(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. Evidently,
correlating the clock on international communications is even more
complicated than statistics! Good luck!) 6: Events alert: Life Science Alley Conference & Expo If you make it to the Life Science Alley Conference & Expo in Minneapolis on December 8th, please stop by the Stat-Ease booth (#305) for a chat about DOE and what we have done or can do for you. To register go here. Click this link for a list of upcoming appearances by Stat-Ease professionals. We hope to see you sometime in the near future! 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. 7: Workshop Alert: See when and where to learn about DOE
Seats are filling fast for the following DOE classes. If possible, enroll at least 4 weeks prior to the date so your place can be assured.
However, do not hesitate to ask whether seats remain on classes that are fast approaching! Also, take advantage of up to a $395 discount when you
take two complementary workshops that are offered on consecutive days.
** Attend both SDOE and DELS to save $295 in overall cost! *** Take both MIX and MIX2 to earn $395 off the combined tuition! See this link to listing of upcoming classes for complete schedule and site information on all Stat-Ease workshops open to the public. To enroll, click the "register online" link on our website 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 protected].
8: Heads-up on DOE FAQ Alert format: HTML version in the worksI put the final touches to an HTML version of the DOE FAQ Alert, which
for over a decade now (first issue April 2000) has gone out in
text only. I suppose some folks like me who resist change may struggle a bit with the new look. If so, let me know. However,
I'm not likely to look back—it's full steam ahead! | ||||||||||||||||||||||
Please do not send me requests to subscribe or unsubscribe—follow the instructions at the very end of this message.
I hope you learned something from this issue. Address your general questions and comments to me at: [email protected]. Sincerely, Mark Mark J. Anderson, PE, CQE Trademarks: Stat-Ease, Design-Ease, Design-Expert and
Statistics Made Easy are registered trademarks of
Stat-Ease, Inc. |
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