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What Control Chart to Use

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  • #37266

    Ripley
    Member

    I need some advice about which control chart to use.
    I am tracking number of defects per month.  I want to see if any month has a number of defects that are statistically greater than any other month.  What control chart should I use?

    May-04
    3

    Jun-04
    6

    Jul-04
    8

    Aug-04
    1

    Sep-04
    2

    Oct-04
    0

    0
    #109367

    Jeff
    Participant

    Use a C chart

    0
    #109369

    Ken Feldman
    Participant

    C chart for equal opportunities but a U chart for unequal opportunities.

    0
    #109385

    walden
    Participant

    A c-chart requires a constant sample size. Defects per month by itself is pretty ambiguous.
    Unless you assure that your sample size is the same for every month, a u-chart would be most appropriate. Plot the number of defects found divided by the number inspected for each month.

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