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Run Chart – Subgrouping

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  • #44915

    Sushant
    Member

    Hi,
    While doing subgrouping in Run Chart.. can we only use time variable (like Week, Month etc) for subgrouping or can use other segmentation factor like Client, Biz Type etc?
    Regards,
    Sushant
     
     

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    #144918

    Dr. Mikel Harry
    Member

    Focus first on subgrouping per segment to focus on apple to apple and avoid irregular fluctuations.
    If based on historical information week to week or time interval does not change that much then no need to subgroup BUT if there’s any time interval which is glaring, then consider also subgrouping per time interval on top of the segments mentioned above.

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    #144977

    Sushant
    Member

    Thanks Mike

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    #144978

    Monk
    Participant

    Sushant,
    Run chart is essentially done with the x-axis denoting the time factor represented by date, week no, month.
    Also, it is very fundamental thing to understand that you have to necessarily plot /compare similar data over the time span that you would like to plot.
    It is advisableto plot different run charts for different clients, for a given subgroup.
    Monk

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    #145017

    Stats god
    Member

    Take your data and throw away the time factor.  Mix the data.  Then chart it. Does this sound stupid ?
    That is exactly what is done with hypothesis testing, student-T, and ANOVA within the six sigma context !!!!!

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    #145466

    Fontanilla
    Participant

    Stats God, you obviously have made a typo here.  It should be “Stats Dog” because you certainly don’t know what you are talking about.  Maybe  you have some small kernel of knowledge about this subject but obviously have difficulty expressing yourself.  Have your mother submit your next posting for you, o.k.?
    Mis-application of the tools used in hypothesis testing and ANOVA certainly could lead a small-minded individual like yourself come to the conclusions you’ve posted.  However, when taken in the context of the problem and how they are applied, the hypothesis testing and ANOVA techniques are quite powerful.  Maybe you should do some research before you post.
    But let’s stick to the original question, shall we?  The answer to the question is whether or not the control chart requires time factors or, can the subgroups be based on categorical factors.  Yes, you can subgroup on categorical factors.  You would do this to determine if you have significant difference between clients, business type, etc.  You might also try using a Multi-Vari chart and include the time factors to show performance.
    And, pay no attention to those individuals who sometimes get onto this site and post nonsense like Stats Dog does.  His point might be valid in a particular context but since he offers no further explanation, you can take it under advisement but don’t let it stop you.
    Good luck.

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    #145544

    Jonathon Andell
    Participant

    There is some risk that you won’t know which of several factors are generating a given special cause. I recommend trying a multi-vari chart first, which gives you the ability to look at those factors through your sampling design. You can analyze the data graphically and using ANOVA (also remember to try some tests for equal variance, even if you must run each one semi-manually).Once your knowledge advances a bit more, you should be able to come up with a reasonbale subgroup scheme. Most likely a better one than any of us can generate prior to obtaining that knowledge.

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