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cpk on non-normal distribution (limited intervals)

Discussion in 'Capability - Process, Machine, Gage …' started by Marco2mac, Sep 4, 2020.

  1. Marco2mac

    Marco2mac New Member

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    Hello!
    first of all, thanx in advance for your attention and your support
    I've a lack of knowledge than is blocking my analysis.

    We register the efficiency of a process, measured as percentage.
    Requirement is that minimum values has to be >95%, our data populations are distributed between 97% and 100%

    I was required to define a ppk of this variable.... but I can't really approach it because I don't know how to handle cases where there is a physical upper (or lower) limits.

    Could someone indicate me the correct approach?
    thank you in advance
    Marco
     
  2. Bev D

    Bev D Moderator Staff Member

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    Welcome Marco2mac! :)

    By efficiency do you mean yield, uptime, on-time delivery, productivity? Or something else? Knowing the specific measure will help us.

    That said, a Ppk index of these types of metrics is not warranted. Ppk is for continuous data characteristics that have engineered specifications.
     
    Andy Nichols likes this.

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