iSixSigma

Ken K.

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  • Ken K. replied to the topic Too Much Agression in the forum General 18 years, 8 months ago

    After reading some of these responses I feel like I should have prefaced all my posts with . . .
    “The following comments are my opinions and my opinions alone – they likely do not represent the only solution or truth. There is no intention to outdo, confuse, or offend anyone, regardless of education, occupation, experience, nationality, cu…[Read more]

  • Ken K. replied to the topic Training material!! in the forum General 18 years, 8 months ago

    The training you run really depends on what you want the Green Belts to do.
    I tend to think that a VERY fundamental set of tools can take people a long way, but 4 days is pretty short.
    Hmmm, let me think. I suppose you’ll need to focus on simpler techniques. First take a look at Roger Hoerl’s article in Journal of Quality Technology – it might…[Read more]

  • Denton & Stan are right on both counts.
    (WARNING – long answer ahead)
    For many common statistical tests, such as z & t tests and F-tests in ANOVAs, the assumption is that the means are normally distributed. As Denton mentioned, the raw data don’t really have to be normally distributed (I has posted a question related to this some time ago).
    The…[Read more]

  • Although I can speak directly to quality levels for my business (that is sensitive information), for complicated products or processes I’d guess that Sigma levels that high are rare, but I suppose its possible.
    Such levels are more possible for less complicated products or processes – I would think somewhere there are nearly perfect processes out there.

  • Ken K. replied to the topic Too Much Agression in the forum General 18 years, 8 months ago

    Well put.

  • Ken K. replied to the topic Too Much Agression in the forum General 18 years, 8 months ago

    No offense taken, but I don’t recall “attacking” anyone or being agressive. That is just not in my nature.
    All I can think of is that you are referring to my message to “MUHANNAD AL NABULSI” regarding some of his odd posts. My point was that they were quiz-type questions that didn’t seem real. Examples:
    “Sketch  a boxplot of the following…[Read more]

  • Ken K. replied to the topic Training material!! in the forum General 18 years, 8 months ago

    I agree that statistics is just part of the BB “package”. That is why I specified “For statistics”.
    For other topics we use a combination of sources – internal courses, external courses (such as Minitab Inc’s, or Ford’s 8D problem solving), and, lately, CD-ROM-based training. We also do some (not much) self-learning activities.
    We are lucky…[Read more]

  • Ken K. replied to the topic Training material!! in the forum General 18 years, 8 months ago

    For statistics training we use Minitab Inc.’s trainers. They provide excellent classes, VERY skilled and experienced teachers, the training materials are very nice (not powerpoint) and the courses are 100% hands on. You can read about their training capabilities at
    http://www.minitab.com/training/index.htm
    As an example, this link takes you to…[Read more]

  • Very good advice Mike!
    In additon, to focus on the methodology:
    1. Understand your process very well. Stare at it (Mike’s comment). Ask operators about it. Map it. Look for deviations from the “normal” process. Map them.
    2. Find the key qualitative & quantitative characteristics of the process – the things you think impact the outgoing…[Read more]

  • It seems that there is not a clear understanding of the root cause for your customer’s defects.
    You need to try to form a JOINT team with your customer to understand the customer defect data, determine the root cause of the defect, and then use that information to identify exactly where the focus of your investigation should, well, focus.
    If…[Read more]

  • I’ll take a crack at this too . . .
    If you are familiar with means and standard deviations then you’ve got a good start.
    First, lets talk about means. Suppose you wanted to measure the amout of radiation each patient receives from a CAT scan from you rmodel XY321 CAT scan equipment. Certainly there is some variation there, and I could see where…[Read more]

  • You did not specify the test that the p-value is associated with. It sort of sounds like you are talking about a test of normality.
    There are several goodness of fit tests for normality – probably the most common are the Shapiro-Wilke Test (the Ryan-Joiner Test in MINITAB), the Anderson-Darling A^2 Test, the Kolmogorov-Smirnov test, and the…[Read more]

  • Ken K. replied to the topic Sample size formulae in the forum General 18 years, 8 months ago

    The ASQ book “How to Choose the Proper Sample Size” by Gary G. Brush gives the following formula (kinda tough in this format):
     
    n = [Z{(1+A)/2] / ARCSIN{(delta/100) / SQRT(PB*(100-PB)/10000)}]
    where Z{p} is the z-value for the standard normal distribution that gives a lower tail area of p.
    A is the confidence level expressed as a proportion (…[Read more]

  • Using:
    Sigma =NORMINV(1-DPMO/1000000,1.5,1)
    The Excel NORMINV function’s estimate of Sigma is accurate to two decimal places between 1.4 and 5.7 Sigma. It is accurate to one decimal place between 5.7 and 6.1 Sigma.
    Using a much longer formula:
    Sigma…[Read more]

  • Using:
    Sigma =NORMINV(1-DPMO/1000000,1.5,1)
    The Excel NORMINV function’s estimate of Sigma is accurate to two decimal places between 1.4 and 5.7 Sigma. It is accurate to one decimal place between 5.7 and 6.1 Sigma.
    Using a much longer formula:
    Sigma…[Read more]

  • Ken K. replied to the topic LSL / USL in the forum General 18 years, 9 months ago

    Both.
    Sometimes we get specs from customer. Someties we don’t, so we determine them ourselves. Sometimes we create specs more stringent that the customer’s and use those instead of the customer’s.

  • Ken K. replied to the topic Sample Size in the forum General 18 years, 9 months ago

    The sample size tool in MINITAB is pretty darn easy to use and highly recommended. If you don’t have adequate statistical software . . .
    http://www.isixsigma.com/library/content/c000709.asp – discussion
    http://www.health.ucalgary.ca/~rollin/stats/ssize/n1.html – calculator
    (Warning: I have not confirmed the calculator’s calculations – swim at y…[Read more]

  • Ken K. replied to the topic The 68-95-99.7 rule in the forum General 18 years, 9 months ago

    This is a prime example of the silly irritating little questions that this person tends to post.
    All he has to do is go to http://www.google.com and enter the post,s title “The 68-95-99.7 Rule” into the search field. He’d get at least a handfull of nice descriptions.
    Please stop being to darn lazy and at least do a search of the internet before…[Read more]

  • Even two people with identical degrees from identical universities can have quite different capabilities, strengths, weakness, and areas of expertise. The same is going to be true for two Black Belts.
    What is the driving force for this common standard?
    Is the desire for “certification” based upon a potential employer’s need to easily weed…[Read more]

  • Bang!!
    You hit the nail right on target!
    Many of the poster’s questions have appeared to generic homework-like questions rather than genuine requests for help.
    Also, if the poster is simply trying to instigate discussion, I have other things to do than discuss minor details of common techniques.
    I am more than happy to help those who seem to…[Read more]

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