Robert Butler


  • @derekkoz – as the learned @rbutler identifies, once you limit the number of decimal places you are going to use, you have created a discrete measure.  The key is whether the number of decimals is sufficient to provide the resolution needed to answer the question being investigated.  Now, don’t get me wrong, there are certainly absolute discrete m…[Read more]

  • It seems you do have a UCL. :)

    hope all is well with you @rbutler ! 2 weeks, 1 day ago

  • @rbutler you are kind to help with homework. :)

    Stay safe and hope your family stays well! 1 month, 1 week ago

  • Thanks @rbutler for you time :-)

    “What your post does suggest is you have some understanding of why coils are rejected.  For example, you mentioned dark surface on wire is cause for rejection….and what else?”

    In fact it is his department’s process where coils are wet-processed such as degreasing and then coils go for the inspection before de…[Read more]

  • @rbutler

    Fantastic Idea Robert (in the file) 2 months, 2 weeks ago

  • @rbutler – Big Brother is always watching ;-} 2 months, 4 weeks ago

  • @rbutler – and simple algebra at that ;-) 2 months, 4 weeks ago

  • @irfan.ahanger01 – I’m certainly not going to disagree with @rbutler (good to see you’re still here, trying to educate the masses!), but I would take a more pragmatic approach.  You already have a design with the center points, so you need to add the Star Points.  For each factor, you will need two – a high and a low, set at an alpha level – to a…[Read more]

  • @rbutler and @darth — If you look at the newsletter, I’ve been sharing “Classic iSixSigma” discussions the past couple of weeks. This is one of them.

    As for any others, one was spam that I deleted as soon as I saw it. 5 months ago

  • @rbutler  Glad it isn’t just me.  People must be so bored that they are getting back onto (LOL) and so desperate for something to do they are responding to decade old posts.  Next might be responses to test questions or dissertation topics from people who graduated a decade ago.  We might even see someone pop in to comment on the…[Read more]

  • This attached planning sheet helps me to focus.  I hope it helps you too!


    If you combine completing it with the help @rbutler has provided you should be in the right area! 5 months, 1 week ago

  • @Timmaaay I don’t normally say anything after Robert @rbutler posts because when it comes to the numbers you aren’t going to get better advice that what you get from Robert. He has this down pretty solid and he understands application not just theory.

    I am not trying to make excuses for who ever wrote the WI. You might want to check out the…[Read more]

  • Thanks a lot @rbutler

    I have found some references you mentioned and I will use them.


      6 months, 1 week ago

  • Thanks for your reply @rbutler.

    I think some parts of my previous post was not clear.

    I need to mention I can change my “stiffness” or “pipe motion” values, but the provided values (such as 5,10,100,500,1000,5000 for stiffness and 1.2,1.5,1.8,2.4,2.7,3,3.3,3.6,3.9,4.2,4.5 m for pipe motion) are my critical points and I want to use these data to…[Read more]

  • Thanks for the notification, @Andy-Parr.

    As @KatieBarry and @RButler pointed out, we’re in a constant battle with spambots to save civilization. 🤣

    And we’re not the only one. I think all social media sites are facing the daunting task of preventing spam. Here are invitation links from Linkedin:


    I will say that Katie does a heroic job of…[Read more]

  • @Andy-Parr As @rbutler said, that is a spammer. He’s been particularly persistent this week, getting through our normal traps. (He’s also pesky by getting through those traps when some of us are still asleep!) We’re creating some more blocks to stop future spammers of his ilk moving forward, but it will take us a few days to get those set up. In…[Read more]

  • Thank you. I had feeling it might be. Deleted now.


    @rbutler I hope you are well and staying safe! 7 months, 3 weeks ago

  • @rbutler

    In regards to your questions –

    The process and test method are two different things:

    • The process of making the test article was performed by a single, qualified operator, using one calibrated piece of equipment set to one temperature and air flow rate. The process monitoring routinely shows distinct categories – goodness knows why…

    [Read more]

  • @rbutler, @Mike-Carnel, @Darth, @David007, @cseider

    @Sharmin, @BayanKamal, @paulchen, @jazzchuck, @Hajo, @Yeoh


    Yesterday 8 March 2020 a graduate of mine phoned me. We were remembering the time when several of my students were able to read PEER REVIEWED papers PUBLSHED in REPUTED Journals and to find the BMWs of the REPUTED Authors!!!!

    She…[Read more]

  • For the casual reader who is late to this spectacle and who does not wish to plow through all 94 posts …. as done by “@rbutler Senior Biotatistician” (@rbutlerSB, for short!)


    @rbutlerSB was the first to reply ; perhaps he wants to be

    • ·         The last straw that breaks the camel back………..


    AS SAID by @rbutlerSB

    • ·       

    [Read more]

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