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Classification name needed

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  • #47814

    Ron
    Member

    I am performing data comparrison from due date to completion date and need a classification name for it.  Some completion dates are prior to the due date, some on the due date and some after so the classification name must capture all possibilities.
    All suggestions are welcome and appreciated.
    Thanks,  Ron

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    #159879

    Gordon Paisley
    Participant

    I would probably count it as time compared to the due date.  Therefore, negative days would be “earlies”, 0 days would be “on-times” and positives would be “lates”.  I would look for what kinds of factors were more likely to create earlies, on-times and lates.
    Your spec limits would proably be some range of maybe a day or two early or a day or two late–depending on your process.  The shape of your data will tell you a lot about your process–that is, are people actually working towards the target or is it a pure normal distribution.
    Best Regards,
    Gordon

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    #159881

    BTDT
    Participant

    Ron:GE had an entire initiative called VTW – variance to want. We tracked the number of days early or late for deliveries. This metric was reported as “span” on VTW. It was reported as the P5-P95 interval using the Excel, “=PERCENTILE(ARRAY,P)” function.Cheers, BTDT

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    #159886

    Ron
    Member

    Thank you BTDT.  That is just what I was looking for!  I appreciate your time and help. 
    Thanks again,  Ron

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    #159887

    BTDT
    Participant

    Ron:Read this message and follow the links at the end.https://www.isixsigma.com/forum/showmessage.asp?messageID=114227Cheers, BTDT

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    #159891

    Gordon Paisley
    Participant

    Incidentally, GE changed the definition of span to be the 1st and 99th percentiles as they got better in meeting customer want.  The idea was that if you use 9/95 span, you are essentially still dissatisfying 10% of your customers (or 10% of your deliveries).  The 1/99 Span tightened up the requirement so only 2% of deliveries were excluded.  Obviously, you still worked to reduce those as well, because they are certainly defects to the customer.
    Another concept that comes in here is that “earlies drive lates”, that is: when the process is delivering a lot of products early, (which is not always a good thing), it is often causing something else to be late.  As you look at your process, keep your eyes open for cases of what may be causing some items to be early at the expense of others.  If this is a people-driven process, you may find people doing their own form of arbitrage, completing the easier/more reqerding/more ‘urgent’/other items first.
    Best Regards,
    Gordon

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