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Need advise on the ARL of Cusum EWMA chart

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  • #36178

    DC
    Participant

    Hi,
     
    When I construct the Cusum or EWMA chart, the ARL value does not seem to be needed or maybe I have miss out anything? 
     
    So my question is on the ARL value: What is it for? How is it applied/ used?
     
    Any clear advise out there to help me out.
     
    Many thanks.

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    #103564

    John Noguera
    Participant

    You cannot “dial-up” the ARL characteristics. They are a function of lambda, stdev multiplier, and sample size  (EWMA) or h, k, sample size (CUSUM). There are also some start-up options for Fast Initial Response.
    Search through Journal of Quality Technology and Technometrics for additional information.
     

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