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Capability for discrete data, not sure what distribution is called

Discussion in 'Capability - Process, Machine, Gage …' started by proyer, Mar 8, 2020.

  1. proyer

    proyer New Member

    Mar 6, 2020
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    I'm trying to do capability analysis on the count of items dispensed. The values are discrete since I cannot have 1.2 items dispensed. The trouble is that when I do a capability analysis the predicted performance is way worse than the observed. The spec is 12 +/- 2 items.

    A couple of questions:
    1. What is the name for this kind of distribution, where any integer is allowed but not the probability is not uniform?
    2. If this is indeed not normal, do I do a transform? I used Minitab and I only discrete distribution option I see are binomial and poisson.

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