• Sambuddha replied to the topic KAPPA Stat in the forum General 19 years, 2 months ago

    Six Sigma Cowboy,
    I have an  interesting article that explains the workings of the Kappa statistic. If you are interested, send me your email — I will send the paper your way. It was published a long time ago in Quality Progress, I believe.
    Beyond that if you still need help, I maybe able to help you, since I have done Kappa studies before an…[Read more]

  • Sambuddha replied to the topic X-chart in the forum General 19 years, 7 months ago

    As always, I appreciate your comments. Thank you much.
    The issue that is demonstrated here runs deeper. I will take my case. It is safe to assume that if I am critical about myself, the end result is not a very long thread of discussions :-)
    I had training in statistics (college level)… and I feel, I have moments of failure when som…[Read more]

  • Sambuddha replied to the topic X-chart in the forum General 19 years, 7 months ago

    Why would you not look at the trend of data points ?
    The situation described in the original question was not at all a complete description of the process.
    “but the average (X-value) is still OK ”
    does not draw a good picture in my mind as I didn’t understand the “OK” part of it – did you?
    What if Jo had a bunch of points hugg…[Read more]

  • Andy(?),
    That’s very well put! Specially the game Vs. career part.

  • Sambuddha replied to the topic Quality Progress in the forum General 19 years, 7 months ago

    Very well put. You are absolutely right.
    We, the subscribers (including Reinaldo) are actually “pulling” Six Sigma from QP. QP and ASQ is in the service business (that is how I look at it). They serve the information and discussions that the subscribers want (to your point about VOC).
    The notion that there might be some covert agenda o…[Read more]

  • Neil,
    I like your characterization and delineating the two types of projects :

    Solution-seeking projects
    Solution-implementing projects
    Some of the failures, I believe happens when we try to do both in parallel and ended up getting into an “endless loop”. Clearly differentiating the ultimate purpose (solving vs. implementing) at the o…[Read more]

  • Sambuddha replied to the topic Quality Progress in the forum General 19 years, 7 months ago

    I believe what you see in Quality Progress does not demonstrate a paradigm shift from ISO to Six Sigma. It does show a shift of focus. My analysis is that there are 2 reasons for that :

    A magazine such as QP needs to reflect the subjects of interest of it times. And today, Six Sigma, undoubtedly is a matter of interest, would you…[Read more]

  • Natasha:
    You raise a great issue. I have been trained in traditional project management concepts – WBS, Rolling Wave Project Managements, Range estimates etc.
    I feel the project management methods & concepts promulgated by PMI in US (Project Management Institute) is very good when you are in a position to create a Work Breakdown Structure i.…[Read more]

  • Miguel:
    Cpk is a derived metric (from sd. & specs.). Nothing great/special about that. Except you already know that (as Mike Carnell has pointed out ), there are 2 ways of improving it.
    Thus mean and std. deviation measures will tell you which direction your improvement activity should be aimed. Now Minitab has a response optimizer tool that…[Read more]

  • 6Sigskeptic:
    That was a valid characterization resulting from a 5 minute read. I would even say, not just in business but in science too, new ideas relating to the same subject come and replace the old one. Think of mechanics and ask the questions – Was Copernicus wrong? Was Newton wrong? Will Einstein be proved wrong oneday?
    It is the same way…[Read more]

  • Sambuddha replied to the topic Control limits in the forum General 19 years, 7 months ago

    Are you talking about spec. limits or control limits?
    Tolerance and Control limits are two independent numbers as far as how they are derived are concerned. Tolerance comes from the voice of the customer while control limits are dictated by the voice of the process.
    You, as a design engineer have the hard task of managing risk,…[Read more]

  • Very interesting topic.
    It reminds me of Mike’s (Carnell) comment (email) on the relative importance of leadership imperatives in case of a MBB compared to mastery over statistical  concepts. Same applies to a BB. It is not enough to survive in a political environment. A BB/MBB has to break cultural barriers (more like thick ice she…[Read more]

  • Here are a few I remember:
    Act as though it were impossible to fail – Winston Churchill
    No one can be the best in everything, but you can be your best in everything you DO. – Dave Bruno
    Peaks charm us. The climb to the top doesn’t. With the summit in sight, often, we choose to walk the plains. – Johann Wolfgang von Goethe (paraphrased)
    A…[Read more]

  • Sasikumar,
    The two adjectives you have used viz. “effective” & “proven” are apt and required traits for a consultant to be hired. Evaluating those two descriptors is however not easy by any stretch of imagination, for the reasons very nicely put by Barney.
    So what do you do?
    Meet with the stakeholders of different processes and units of your…[Read more]

  • Julie,
    Std. Deviations don’t add. Variances (square of std. Deviations) do add.
    So here is your formula:
    Pooled Std. Deviation = Sqr.Root(Sum (std. Deviation squared)))
    Now, I don’t know what you are going to do with the “average”std. deviation. Please think carefully about what you want to find out from your data and what analysis would get y[Read more]

  • Karolina,
    This website itself is dedicated to Six Sigma. On the left frame of this message (in blue) you will find a section that says Six Sigma Basics. It starts with an overview and then goes on… That might be a good starting point for you.
    If you have a question in mind try searching this site by using the search field above. Look…[Read more]

  • Nitin,
    Minitab version 13.32 has an Attribute Gage R&R included in the Stat>Quality Tools> Attribute Gage R&R study included as a tool. Read the statguide for more info.
    Here is a tutorial. It includes 2 examples :

    Service Example
    Manufacturing Example
    Kappa statistic is used as a measure of “chance agreement”. It is a pretty controversial…[Read more]

  • Mike,
    You are welcome.
    I know we are digressing here, yet it is important, SS practitioners shared their experiences about consultants, and how they made it work. I understand that many of us look at $X000 a day consultant fees and expect nothing short of miracle cure pills from them, yet, that fails for the same reason, why buying a “degre…[Read more]

  • Ron,
    I agree with your general comments. But, why would you spend 50K when your people might not know how to deploy Six Sigma. In that case that 50 K is a waste, because now what you have are :

    an expenditure of 50 K
    trained people with an open ended purpose, who might be confused as to what to do after training
    My assumption here is that…[Read more]

  • Kathy,
    Great question. The concepts have a subtle difference.
    A Rational Subgroup is simply “a sample in which all of the items are produced under conditions in which only random effects are responsible for the observed variation.”
    Subgrouping often requires one to study the noise tree of a process and come up with a plan that allows one to o…[Read more]

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