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What Kind of Chart?

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  • #51371

    Stumped
    Member

    This one has me stumped.  Can someone help? 
    We receive boxes of product from our customer.  WE do not know how many units are in each box before it arrives.  Some days we receive 1 box, some days we receive as much as 150 boxes.  WE know a day ahead of time how many boxes we are going to receive. 
     
    I would like to establish a control chart to determine whether or not the number of units in each box is stable and predictable, but the regular attribute charts all look goofy, with limits very close to gether an all the points outside, kind of like an MSA chart.  My avg number of pages in a box is about 400; when I look at an individuals chart it is actually stable, but this is not continuous data since I am counting. 
    Any suggestions for this novice today?  I sure would appreciate it.  You can consider this your homerun for the day!  Thanks in advance you brainy people! 

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    #177947

    Taylor
    Participant

    Run Chart

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    #177955

    Stumped
    Member

    Ha.  As I suspected.  Thanks Chad.  Cheers –

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    #178073

    Steven Crowden
    Member

    Hi, do you perhaps think you are looking to implement a solution to a problem that shouldn’t exist?
    Could you not talk to your customer and ensure that the same number of pages are in each box? Then the need for a chart dissapears.
    Just a thought.
     

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    #178077

    GrayR
    Participant

    x-bar/R chart using a variable subgroup size, where x is the average number of pieces per box and the subgroup is the number of boxes received each day.

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