Bill Bentley


  • >> In full disclosure, what was the real reason for your question?

    Geesh guys, it’s not a conspiracy, just a simple question! I asked because someone told me that ISO had new Six Sigma certifications standards and I wanted to know if it’s true and if so where I can find them. I’m in the field and like to know what’s going on. I couldn’t…[Read more]

  • Does ISO offer Six Sigma certification standards or standard body of knowledge?
    9 years, 5 months ago

  • Bill Bentley changed their profile picture 9 years, 6 months ago

  • Yes I know that but thanks for pointing it out! The effect of coding a variable to -1 and +1 in a DOE is still a bit confusing as far as what it does to the resulting regression and what you can and can’t legitimately do with it regarding dropping of terms. 9 years, 8 months ago

  • Good question Joel. I do a lot of training for unemployed professionals and do it at low cost so we are always looking for low cost tools to use, not as ongoing workplace tools but ones which will be effective in a learning environment. A large company may be able to buy bulk licenses of Minitab at prices close to bulk prices of some of these…[Read more]

  • Thanks! Do I actually have to shoot the horses or can I just pretend? :-) 9 years, 8 months ago

  • I use spcxl, doepro, qimacros and minitab at various times. With doepro, their regression model is set up to simply delete terms that fail your hypothesis test from the resulting regression model without re-running it. I got a similar answer from the folks at QIMacros who said that was appropriate when using coded data. But my stats teacher…[Read more]

  • In what circumstances is it OK to simply drop a term in a multiple linear regression when that term fails the hypothesis test for significance? I’ve seen them simply dropped when the data is coded. I learned […] 9 years, 8 months ago

  • Yes I know. Either they can expect to be ignored because this will be a one time activity which will be out of date at some point, or we’ll somehow make it live via a wiki or something. Haven’t decided yet. I have other motivations for doing it so don’t mind. Examining how different experts do the same thing is a good way to add a new dimension…[Read more]

  • End game is just a paper that is a free service to my students and clients. To offer them a hopefully unbiased comparison of packages with their pros and cons so they can choose what appeals to them. I get asked for it all the time. We’ll make it available to everyone. Might put it in a wiki so it can become a living document. Haven’t…[Read more]

  • Thanks everyone. I get two kinds of replies when I look for feedback on software like this. Mostly people tell me what they use that they like it. Occasionally someone will tell me they tried package A and didn’t like it but are now using package B and like that. What I’m looking for is a detailed analysis of the major ones, function by…[Read more]

  • Thanks for the suggestion. I know about them, just forgot to list them. I’m new to this forum. I see we get assigned to levels, I guess based on how much we participate. I’m aluminum, which I assume is the bottom level for newcomers. Glad they didn’t start with mud or something worse!
    9 years, 8 months ago

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