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Attribute DOE

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  • #27413

    Wazza
    Member

    Can anybody help me out – I need some information on attribute DOE. I know it possible by using proportions as a response, but need some further info. Thanks

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    #67065

    Murray
    Participant

    Make sure your sample size is adequate (use sample size calculation for proportions in Minitab and split the sample accross the treatments). If your sample size per treatment is constant, defects can be used as a response. If samples per treatment is not constant, you must do a series of comparisons of proportions.

    Because of sample size required, this is best approached like an EVOP.

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    #67066

    John Noguera
    Participant

    Technically the correct analysis tool is Logistic Regression. How many folks out there actually use it vs approximating with a proportions test?

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    #67070

    Kim Niles
    Participant

    Statistical software packages like Stat-Graphics will perform DOE analysis on attributes. For SGraphics you just fill in a check box.

    You might be wanting to perform paired comparison, where the “DOE” is non-mathematical and very simple based on Tukey’s ranked quick tests. This method can differentiate interaction effects but in general terms such as “approximately 90% confidence in xx significance from factor A”. See: Bhote, Keki and Adi. “World Class Quality – Using Design of Experiments to Make it Happen”. American Management Association. NY. 2000.

    I hope this helps.
    KN http://www.znet.com/~sdsampe/kimn.htm

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