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Cusum chart?

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  • #29260

    Aguilar
    Member

    What is a cusum chart and what its used for?
    What is statistical inference?

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    #74444

    QE
    Participant

    Victor,
    A cusum chart is a type of control chart (cumulative sum control chart).  It is used to detect small changes between 0.5-2.5 sigma.  For larger shifts, Shewart-type charts are just as good and easier to use.  Cusum charts plot the cumulative sum of the deviations between each data point (a sample average) and a reference value, T.  Unlike other control charts, one studying a cusum chart will be concerned with the slope of the plotted line, not just the distance between plotted points and the centerline.  Critical limits for a cusum chart are not fixed or parallel.  And a mask in the shape of a V is usually laid over the chart with the origin over the last plotted point.  Previous points covered by the mask indicate the process has shifted.
    So, who uses these types of charts?  Typically chemical industries.
    Hope this helps!  BTW – a good reference book would be “Statistical Qaulity Design and Control – Contemporary Concepts and Methods”  I received it as part of my BB training, and it is an excellent resource.  Juran’s Quality Handbook is also handy.

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    #74463

    aa
    Participant

    Victor, I have an excellent article on Cusum Chart. However, due to picture content of the document, cannot successful paste into this area. I’ve requested isixsigma.com, to post it as an summary article on cusum chart for beginners and as a ref material. (See below.)It is a successful tools, bit more sophisticated than, the simple moving average chart.regards AA Download CUSUM Charting Article (Microsoft Word format) Download CUSUM Charting Article (Adobe Acrobat format) Download CUSUM Charting Excel File (Microsoft Excel 2000 format) Download CUSUM Charting Excel File (Microsoft Excel 95 format)Viewing Tip: Usually, you can click on a link to view the document — it may open within your browser using the application. If you are having difficulty, try right clicking the link and selecting ‘Save Target As…’ or ‘Save As…’ to save it to your computer harddrive. [Download Help]Virus Note: All files are scanned prior to uploading to iSixSigma. No prevention program is entirely safe. FOR YOUR OWN SAFETY, PLEASE:1) Re-scan downloaded files using your personal virus checker before using it.2) NEVER, EVER run compiled files (.exe’s, .ocx’s, .dll’s etc.). If you don’t have a virus scanner, you can get one at many places on the net including McAfee.com.

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    #74522

    Aguilar
    Member

    Thanks for the answer, yes indeed iam still interested in the information about a “cusum chart” my e-mail is [email protected]
    Thanks again!

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    #74530

    aa
    Participant

    Victor, I have made note for you email, will reply with the attachment. Also note, that isixsigma.com, plans to post the articles too.
    watch the space.

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    #74535

    RR Kunes
    Member

    I’ve never seen one utilized in manufacturing in over twenty years. I would be interested to know if anyone out there currently uses these charts and in what applications.
     

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    #74536

    iSixSigma Community
    Participant

    AA,
    Just follow the directions found to the right of this post (highlighted “Post/Attach Document”) to post your document, and we’ll take care of the rest!

    Best regards,
    iSixSigma Community

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    #74541

    aa
    Participant

    Yes, RR Kunes – we do use them on daily basis for tread analysis on the production plant. An example: typically on our colour performance.
    If you need to know let have your email.
    regards
    AA
     
     

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    #74542

    aa
    Participant

    Dear isixsigma.com,
    Yes, I have done that, and also reply to your email. Check out our mailbox.
    regards
    AA

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    #74558

    iSixSigma Community
    Participant

    AA,
    Your files have been posted to your orginal posting:
    https://www.isixsigma.com/forum/showmessage.asp?messageID=12407
    Thank you for sharing your files with the iSixSigma Community.

    0
Viewing 10 posts - 1 through 10 (of 10 total)

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