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control chart help

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  • #47979

    BB
    Participant

    process measure is # of items actually produced per hour divided by # that should have been produced per hour to get a percent effectiveness to the standard rate of production.
    which should i use?  a p-chart of percentages or c-chart of # of items produced per hour or an I-MR chart of # of items produced per hour because the counts are pretty high (a few thousand per hour)
    Thanks, BB

    0
    #160567

    Evil
    Participant

    Hi BB…
    If your counts of items are sufficiently “away” from zero (which it sounds like it) and there is enough variation in the numbers produced each day, then an I-MR chart would work just fine. A c-chart is also an acceptable alternative. A p chart is not applicable in this case.
    hope this helps…
    E

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    #160571

    Jamilah Haron
    Participant

     Hi,
    Since you are measuring % effectiveness, I suggest p chart .
    Regards.

    0
    #160574

    The New MB
    Member

    Why?P-Chart is  for Defevtive  with  variable  sample  size

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