Katie Barry


  • Thanks @chebetz

    Interesting article.  It’s kind of “wonky” but they seem to be making a mountain out of a mole hill if I have the expression correctly.  Basically, just because one picks the “correct” side of the stat test with the appropriate p-value, there is uncertainty which is why things should always be proven “in the field” or else one w…[Read more]

  • Eric Maass's profile was updated 11 months, 1 week ago

  • @rbutler – a function of the computer generation.  If they had grown up with a slide rule, they would understand.  ;-) 1 year ago

  • @rbutler – well said! 1 year ago

  • @Marc68 – I’m going to take exception to @cseider and @poetengineer in their guidance on this issue.  When determining calibration frequency there are two items to evaluate – the bias and precision.  While an MSA can help, it also introduces issues related to the human element, but that is not what calibration is about.  Calibration is about th…[Read more]

  • @ahamumtaz – You should go back and research the definitions of Cp, Cpk and Sigma that were provided to you.  You should find some verbiage that states something like: Cp is “potential” capability, whereas Cpk is “actual” or “observed” capability.  The difference being the location of the distribution in relation to the target and upper/lower b…[Read more]

  • @derekkoz – as the learned @rbutler identifies, once you limit the number of decimal places you are going to use, you have created a discrete measure.  The key is whether the number of decimals is sufficient to provide the resolution needed to answer the question being investigated.  Now, don’t get me wrong, there are certainly absolute discrete m…[Read more]

  • @geozor – A good approach would be to do a root cause analysis, identifying the several contributors to the issue (a fishbone diagram would be a good approach).  Categorize the several contributors as to their likely impact.  Then select the one that is the greatest contributor and go after improving it so that it either no longer is a c…[Read more]

  • Sure you could.

    Just look at your data–if it’s reported/recorded to the nearest 5 or 10 or 100…then you won’t have the precision potentially to use as continuous.

    Don’t forget to do an MSA! 1 year ago

  • Check this website. or google…but lots of advice out there.

    Basically, find a project with measurable results, a manageable size, identify team members with a project champion and find an impactful goal and start there. 1 year ago

  • Look at the total ppm defective.  Translate between Cpk and sigma level…for that one side of the curve. 1 year 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]

  • thiyagu and Profile picture of David G. FordDavid G. Ford are now friends 1 year ago

  • Please use data for your FMEA ratings.

    Also, many pieces of equipment have recommended calibration frequencies that would be HARD to ignore.  However, have you considered use of SPC for monitoring the measurement systems.  This is a great tool to signal when calibrations are needed. 1 year ago

  • Try working with a social organization you already are a participant.  I’m sure every organization could use some volunteer talents. 1 year ago

  • It seems you do have a UCL. :)

    hope all is well with you @rbutler ! 1 year ago

  • Consider looking up Z normal tables versus sigma and check out tables that don’t “shift” and then consider you will have SOME defect rate at both ends of the curve and add. 1 year, 1 month ago

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