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control Charts

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  • July 8, 2005 at 8:15 pm #39953

    walden
    ★ 10 Years ★
    Participant

    Which control chart is best suited for larger subgroups >15 with unequal sample sizes? Thanks in advance.

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    July 8, 2005 at 8:26 pm #122807

    Larry
    ★ 10 Years ★
    Participant

    x-bar and s is most appropriate (assuming continuous data).

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    July 8, 2005 at 8:55 pm #122809

    Issa
    ★ 10 Years ★
    Participant

    Control charts do not only depend on the sizes of the samples taken. Are you dealing with attribute or variable data?
    The determination of the nature of the Critical-to-Quality (CTQ)characteristics is the first step in evaluation the kind of chart to select.

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    July 8, 2005 at 9:04 pm #122810

    UFO
    ★ 10 Years ★
    Member

    To: Larry
    Fm: UFO
    Your control chart recommendation would be considered reasonable if the larger subgoups retain “rationality.” 
    Generally, as subgroup size increases there is an increasing likelihood of reflecting the influence of one or more assignable causes “within” subgroups rather than “between” subgroups.  Such contamination can impact the control limits and alter the probability of false detection.
    I give your advice to Chris a grade of B+.  You might have gotten an “A” if you were more attentive to details and situational nuances.
     

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    July 9, 2005 at 12:25 am #122821

    Issa
    ★ 10 Years ★
    Participant

    I am glad that someone had enough sens to remove the unnecessary insults from the Forum.
    People come to the forum to have a pleasant, courteous, candid and uplifting discussion. We can be passionate without calling each other names. What did I do UFO to be called what he called me? He does not even know me. 
    If you leave the degrading comments on it, we just refrain from participating to the forum or go somewhere else. The forum makes people visit your site and you know it.
    Issa

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    July 11, 2005 at 10:59 am #122867

    walden
    ★ 10 Years ★
    Participant

    Larry, thanks for the advice, I appreciate it.

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