• I think the main point of the discussion was whether Six Sigma methodology is a practical approach to follow in the service industry. I think it certainly is, because it is not just a set of tools, but a complete philosophy of how to look at processes / activities and how to approach them towards making the output of such processes more…[Read more]

  • Hii
    For comparing Comparing 2 Distributions, – ( when data is not normal ) you can go for the Test of Medians..
    i suggest to do Kuskall- Wallis test of Medians.. here…

  • Folks..
    One thought went through my mind , as i was going through all the messages where, You all missed one Important point which is very critical for Six Sigma Implementation in an Organization.
    Top Management Commitment- Six Sigma is a Business tool to Solve problems to Improve the Bottom Line of a Business..
    So Who should Drive this and…[Read more]

  • vin replied to the topic Lean SS case-study in the forum General 17 years, 7 months ago

    Please email me a copy of ur case study to [email protected]

  • vin replied to the topic Certification in India in the forum General 18 years, 3 months ago

    As all of you aware each companies have their own Crterias for certification Like for GE, NCR, Wipro etc..
    if  you are looking for a common certification–that is recognised through out the world  and good enough is ASQ certification..
    u can Go throug the American Society of Quality ( ASQ ) Web site  and get the required information re…[Read more]

  • By the way, the opinion I voiced in the first paragraph of my last post pertains specifically to the hypothetical process I mentioned in that paragraph, NOT to JohnK’s process.  Depending on the specific circumstances around JohnK’s process (e.g. Is this the most problematic process in the company?  Is the characteristic being measured co…[Read more]

  • Please keep in mind  that  distinct categories is dependent on the total variation i.e. if you have a process sigma of 0.1″ and the tolerance is +/- 1.5″ you could end up with a very large % Study var and a very low P/T ratio.  In this case, you might not necessarilly have to improve the gage, as long as P/T ratio is low, since your process is ve…[Read more]

  • John,
    My opinion – it depends on what you intend to do with the gage.  Typically, 10% or less %variation and P/T ratio is considered good, anything above that is grey area up until 30% or so.  Above 30% is usually deemed “unacceptable.”
    If the gage is used to inspect parts and segregate good pieces from bad, then P/T ratio (% Tolerance) is the m…[Read more]

  • vin replied to the topic Criticism of Six Sigma in the forum General 20 years, 7 months ago

    Mike – Are these “criticisms of Six Sigma” addressed in”Leaning Into Six Sigma”? (I read a brief write-up on it as part of an article in IndustryWeek magazine.)

  • vin replied to the topic Gage RR Studies in the forum General 20 years, 8 months ago

    Ideally, the part-to-part variation you see in your GR&R should be representative of the normal variation you would see in production.  Then, proportionally you should see part-to-part variation to be significantly larger than your repeatability and reproducibility variation if you have a capable measurement system.
    If the part-to-part…[Read more]

  • I believe that it basically defines how many different “buckets” you could reliably segregate product into i.e. Distinct Categories = 2, then it is a go-no-go gage;  Distinct Catergories = 3 means low, med, high, etc.
    By the way,  you need to round down to the nearest whole number after using the equation you listed.  As for the 1.41, I’m not su…[Read more]

  • vin replied to the topic Gage RR in the forum General 20 years, 8 months ago

    If you have a lot of parts that you can measure, could you try the following?
    Take 60 parts from one, homogenous (as best as you can tell) population.
    Randomly divide the 60 into 2 groups of 30.
    Measure first group with old gage, then second group with new gage.
    Calculate variance of each group.
    Total Variance = Variance of parts +…[Read more]

  • David – My interpretation of your original post is as follows:
    1) Six Sigma professionals/consultants are overpaid.
    2) Six Sigma professionals/consultants are barely competent when it comes to the use of statistical tools for data analysis.
    3) The Six Sigma consultants that responded with their per diem rates are probably lying.
    That is my i…[Read more]

  • David,
    With all due respect, I think Six Sigma focuses on applied statistics, problem solving, and business process improvement and not necessarily statisitics.  Although the proper use of statistical tools is a cornerstone of the Six Sigma methodology, it does not, in and of itself, accurately and completely define what Black Belts and Master B…[Read more]

  • vin replied to the topic Shanin for Mimi in the forum General 20 years, 9 months ago

    Mike – No need to apologize to me (as long as your more pointed comments were not directed right at me :)
    I definitely agree with you…some people have a propensity for playing “buzzword bingo” and follow the latest craze as if it were a newly-formed religion.  On top of that, some people will have you believe that some of these “new” tools are…[Read more]

  • vin replied to the topic Shanin for Mimi in the forum General 20 years, 9 months ago

    Thanks for your feedback.  However, just to clarify, I would like to say that I didn’t mean Shainin was better than Six Sigma in all respects, but that it may be better suited for certain applications.  I think that for a well-defined, very technical problem especially in an assembly environment, Shainin, with its Component Search and o…[Read more]

  • vin replied to the topic Shanin for Mimi in the forum General 20 years, 9 months ago

    The Shainin group has a web-site and also offers training in what they call Red X, Green Y, etc.  Various levels of certification are offered (I believe they go by Apprentice, Journeyman, and Master).  I don’t know if the training seminars are totally open to the public or if you have to come from a client company.  Perhaps somebody else ha…[Read more]

  • vin replied to the topic Master Black Belt in the forum General 20 years, 9 months ago

    If I had to choose between MS Statistics and MBA, which one would be more appropriate?

  • vin replied to the topic Master Black Belt in the forum General 20 years, 9 months ago

    Mark, Lisa,
    Thank you for your responses.  One of my reasons for asking is because I am considering going for my MBA and also going for ASQ Certified Quality Engineer (CQE) certification.  Which one, if either or both, will be beneficial to me if my eventual goal is to be a Master Black Belt?

  • vin replied to the topic for very small businesses in the forum General 20 years, 10 months ago

    Steve – I believe Six Sigma benefits companies of all sizes. However, as the others have pointed out, the start-up costs of a Six Sigma program can be quite high and may not be a viable option for smaller organizations.How about this idea: Hire 1 Six Sigma Black Belt or Green Belt into your company to fill an EXISTING open position (assuming…[Read more]

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