Eric Maass


  • Hi Roger,

    It sounds like you were given a set of individual cycle time measurements…and they want you to estimate the cycle time 80% of the time…Which is a rather vague request.
    If they wanted you to tell them a value that 80% of the cycle time values are less than, then you would want to sort the data, and find the value that 80% are…[Read more]

  • Hi Miguel,
    Can you clarify your request a bit?
    LSC and USC – I assume you mean Lower Specl Limit and Upper Spec Limit?
    Are you measuring yield for a continuous parameter? If so, what are the limits for that […] 9 years, 10 months ago

  • Thanks, John! You have an amazing breadth and depth of experience with developing great Excel add-ins and tools for Six Sigma and statistical efforts!

    Best regards,
    Eric 9 years, 11 months ago

  • Several aspects, largely financial:
    1) According to research, it takes 10 to 20 times as much investment to gain a new customer as to retain an existing customer – it makes business sense to do your best to retain the existing customer base. Research also shows that the major cause of customer defections is loss of confidence in the…[Read more]

  • Mike,

    Oops!! I missed the sarcasm…I guess you just come across as such a nice guy, it didn’t occur to me that you were using sarcasm. My bad! :)

    Best regards,
    Eric 10 years, 3 months ago

  • Mike,

    You are correct…

    Thomas Edison could not have been a TRIZ user. Edison passed away in 1931. TRIZ was invented in Russia, starting around 1946… shortly thereafter, Josef Stalin sent the inventor of TRIZ (Dr. Altschuller) to Siberia….

    Dr. Altschuller’s research of patents, that led to the TRIZ approach, would very likely have…[Read more]

  • Ah…I finally was able to log in under my former username – Yea!

    Samantha – I think MBBinWi was right about Concurrent Engineering – you can research it, but it likely won’t fit in well with the overall theme of your research paper.

    The overlap between DFSS and Systems Engineering starts at the front end – understanding the customer…[Read more]

  • Eric Maass changed their profile picture 10 years, 6 months ago

  • Eric Maass replied to the topic Welcome Back Mike in the forum Welcome 10 years, 7 months ago


    Welcome back!

    Thanks for already setting an atmosphere of responsiveness, of asking for the Voice of the Customer!

    Best regards,

  • Hello Gripper,

    Thanks for the challenging request.

    Some suggestions:

    1) First, do your best to clarify with the executives / management what you are really trying to optimize, and how to measure it. How can you measure “effectiveness”?
    “Costs” sounds clear, but how will they know that you have optimized “costs”?
    Mostly, the type of…[Read more]

  • Hi Michelle,

    One way to handle this is to extract the time for each sequence of 1’s bookcased by zeros’ before and after. So, for the short set of data you provided, if I understand correctly, it seems that the equipment started working sometime between 9:03 and 9:06 AM, and stopped cutting material sometime between 9:15 AM and 9:18 AM.

    In…[Read more]

  • Eric Maass replied to the topic Hi All in the forum Welcome 11 years, 5 months ago

    Hi Mamoon, and welcome to the iSixSigma Forum!

    Isn’t it great to be open to learning new things? I hope you learn many new approaches and ideas and perspectives that help you grow and progress.

    Best regards,

  • Hello Karma,

    One of the main intentions of Statistical Control Charts is to detect the difference between common cause variation and special cause varation. As part of that, the control limits and rules are intended to prevent over-reaction. In fact, the rules and control limits for many control charts have a relatively low alpha risk (the…[Read more]

  • Hi Karma,

    Well, one alternative that was developed for group decision making is Accord’s Robust Decision software package:

    Best regards,

    P.S. No, I”m not a salesman for Accord….they demonstrated their product to me several years ago, and I’ve kept it in the back of my…[Read more]

  • Hi rkoganti,

    Some or all of the simulation software programs you mentioned are for Discrete Event Simulation, which is a bit different from Monte Carlo Simulation.

    In Discrete Event Simulation (D.E.S.), you model the process as individual steps linked together, set up a statistical distribution for the arrival rate (how often new material…[Read more]

  • Some ideas:

    1) Can you switch your frequency from monthly to weekly? Almost magically,
    that could change your number of values from 7 to more than 25.

    2) If you must stay monthly, can you go back further in time – so, about 2 years?

    3) If you must stay monthly and must stay with 7 values, you can come up with a baseline number -…[Read more]

  • Mark,Remi is right. Alternatively, if you are more comfortable with
    probability theory, you could estimate the yield for
    each of the 6 characteristics as [1e6 – 600 ppm]*1e-
    6 – .9994, and – like Remi said – if yo assume they
    are independent, you could multiply them…or, since
    each of the 6 characteristics have 600 ppm, you
    would…[Read more]

  • Madhukar -I don’t know if this is the problem in your specific
    case, but it is often difficult to get consistent
    results with Multiple Linear Regression when the
    “independent variables” are not independent – that
    is, when they are correlated. Can you get the
    matrix of correlation coefficients among the 6
    “independent” input…[Read more]

  • Eugene,BTDT gave you good advice, but let me expand on it
    to help you when you meet with the chemist.If your mixture contains a buffer,then the
    dependence of the pH on the amount of chemicals like
    acids or bases in the mixture will be very non-
    linear. Please visit the url to see the graph below.…[Read more]

  • DC,
    If you can get the sample size up a bit, I think you can optimize using Binary Logistic Regression analysis. You can think of it as moving from 0/1 that you’re seeing now, to analyzing the probability of having a defect, from 0 to 100%.  I think you can stay with the CCD (Central Composite Design) for the response surface design, but the…[Read more]

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