Robert Butler


  • Hi @jaimie.slater — Welcome to

    We have a whole New to Six Sigma section of content here:

    Specific to books, here’s this post:

    If you search the site, you’ll likely find other book recommendations. Perhaps don’t…[Read more]

  • @Gaugu Welcome to the iSixSigma community! 1 week ago

  • @jonobbas20 Looks like you didn’t search before posing your question. Here’s a previous discussion that relates: 1 week ago

  • Sadly, I saw study materials from a course at a university MBA program state that 6 sigma is because of the +/- 3 sigma.  Amazing how diluted the teachings are from the early 90s.

    I wasn’t in the class but told the student that wasn’t six sigma meant.

      1 week, 2 days ago

  • I’d say fix the measurement system.

    Just saying AFTER fixed, it would probably allow the Anderson Darling test to come to another conclusion. 1 week, 6 days ago

  • @cseider Just for clarification are you suggesting not check nor fixing the measurement system and just running nonparametric tests instead?

      1 week, 6 days ago

  • @rheaestrael Probably not much different answer than @Robert Butler or @cseider. You take everything you can get as far back as you can get it and plot it. No nonsense control chart stuff just a plain time series plot and look at it for patterns, trends, runs, shifts and cycles. Then you mark the things Robert suggested where the process has…[Read more]

  • @cseider Let’s see if I draw a line and mark 0 then mark off 1-10 at equal intervals on the line and then mark 3, 4.5 and 6 I might get a clue. 1 week, 6 days ago

  • @mike-carnell “what about 4.5 sigma”?  :) 1 week, 6 days ago

  • the correct ones?

    My curiosity is piqued. 1 week, 6 days ago

  • If you followed the DMAIC methodology you would have checked your measurement system.  My educated guess is it won’t pass a good variable gage R&R.  This is PART of the reason your normality tests are failing but don’t fret too much if it doesn’t pass…median shifts are just as valid for statistical confidence–yes I know how my friend R. B…[Read more]

  • Have you considered following the classic DMAIC process?  You should already have gathered data on some of the X’s and looked for POTENTIAL/PROBABLE X’s in the measure/analyze phases.

    If you are trying to create a DOE and can’t get support–are you 1. making sure the process participants are part of the team and 2. giving updates to the team and…[Read more]

  • Yes, your service industry definitely has many peaks and valleys–especially if in the retail arena.

    Some thoughts to consider

    1.  How “easy” is past data for the metric that was agreed by the project sponsor/project leader?  If easy, see if any sign of seasonality and that may help you decide on what time frame for getting an average or s…[Read more]

  • Processes in the service industry changes drastically, thus the need to always create baseline targets.

    What are the statistical tools that you use to create baseline? How far back on the historical data that you would recommend using and by what frequency? (day wise, weekly, monthly) 2 weeks, 1 day ago

  • @pratikpawar8888 Welcome to! There’s lots of good information on the site.

    It looks like you didn’t take advantage of our search function, but in answer to your questions, here are links to sections on:

    [Read more]

  • @Youssef_DO The advice about measuring emotions is a good start but mare complicated than that. You need to have a measurement system that is precise and accurate. That is MSA. If you cannot apply MSA and get an acceptable result on the analysis then you are wasting everyone’s time trying to apply Six Sigma.

    There is a reason that rulers are not…[Read more]

  • You need to take this a piece at a time, Start with you last question “moreover is 6 standard deviations greater or lesser than 3 standard deviations in the normal distribution?” If you cannot answer this or understand this then the discussion od control limits and spec limits will never make any sense to you. 1 month, 1 week ago

  • tapiseniryan That is a question that sounds very profound on some esoteric level. What does it actually mean? Let’s say we do some research and find out that your bachelors degree in a particular subject has an average placement rate of a certain percentage. It has a mean starting salary with a standard deviation. There should be benchmarks that…[Read more]

  • @tapiseniryan Did you search our site before asking your question? We have an education section of content: 1 month, 1 week ago

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