Eric Maass


  • Eric Maass's profile was updated 8 months, 4 weeks ago

  • Hi Marc68

    You could consider Preventative Maintenance for analytical instruments in the pharmaceutical industry to be a tradeoff between Risk and Cost. The statistical analysis comes in to play as a way to balance Risk and Cost.

    Taking these to an extreme – if Risk was “high” and PM/Calibration was “free” (cost was “extremely low”), if three was…[Read more]

  • Hi Anonymous,

    Yes, the best way to learn is to learn by doing – applying your new Six Sigma skills.

    You could approach some managers at the local manufacturing plants, supermarkets, warehouses in your country and offer to work with them on a voluntary basis.

    I can try to mentor you – you can contact me at [email protected]


    Best…[Read more]

  • Buenos diaz, Carlos!  Welcome to iSixSigma – I hope you find lots of interesting information here and that you get a chance to exchange ideas with others on similar and diverging journeys!

    welcome 1 year, 2 months ago

  • Hi Techyanuj,

    Here is an summary that you might find helpful:

    Best regards,



      1 year, 2 months ago

  • Eric Maass's profile was updated 1 year, 7 months ago

  • Eric Maass changed their profile picture 7 years, 8 months ago

  • Elena,

    I suggest you click on “terms” and get rid of at least one of the highest order interactions, like “ABC” .

    When you reduce the terms by taking a term out of the analysis, the degrees of freedom available for the error terms will increase and you should be able to see p values.

    Also, you might want to click on the graphs button and…[Read more]

  • Hi Joppie,
    The equation, r = +/- 1.96 sqrt(STDev), seems to use 1.96 for the 95% confidence interval that should include the mean measurement value. The term “repeatability” actually refers to the standard […] 8 years, 9 months ago

  • I skipped a step in sharing the search…
    Here is the reference that the anonymous comment said was in error:

    Schmidt, S.R. and R.G. Launsby, Understanding Industrial Designed Experiments, Air Academy Press, Colorado Springs, CO, 1997.

    You could also get that from…[Read more]

  • Hi Luis,

    Well, I checked out the articles from Quality Progress in 1997
    ( ) and did not find the referenced article.

    So, continuing on as a nerdy Sherlock Holmes, I found this comment:

    QUALITY DIGEST | SAT, 06/05/2004
    Hi, I noticed that you reference Schmidt &…[Read more]

  • I’ve recently seen some good results combining Value Stream Mapping and Discrete Event Simulation using Simul8. 8 years, 9 months ago

  • Hello, Luis,

    I have never used that formula, preferring to use Excel’s built-in functions for cumulative normal distributions…but this is referred to as:
    Schmidt S. and Launsby, Quality Progress, 1997

    Best regards,
    Eric 8 years, 9 months ago

  • Cathy,

    There is no accrediting organization for six sigma / lean six sigma training providers.

    The relevant question might be: after you are certified, will your certification be accepted and will you be considered credible as a certified green belt or black belt or whatever.

    Now, I’m a certified Black Belt and Master Black Belt, from the…[Read more]

  • Valid,
    What are you trying to mistake-proof: the tendency to have missing information in the first place, prompting the follow up…or something in the follow up procedure?
    Best regards,
    8 years, 9 months ago

  • Load More