Six Sigma – iSixSigma Forums Old Forums General ANOM vs ANOVA

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    Personally, I like ANOM because I can identify immediatly that which subgroup is difference from the group but it seem that this technique do not popular as ANOVA.
    1. What is the difference between ANOM and ANOVA, which one is better?
    2. How to calculate Power of detection of ANOM ?


    Robert Butler

      ANOM and ANOVA under many circumstances will give similar results.  The key difference between the two is that ANOM compares the sub-group mean to the grand mean of the data under examination while ANOVA compares the sub-group means with one another.  Thus the answer to the question “which one is better” is: it depends on the question you wish to answer.  If you have access to Minitab open up the help document and do a search on ANOM.  You will get a brief overview as well as a number of cites of critical papers on this subject.
      If you don’t have access to Minitab then it would appear that the following paper should help answer any other questions you might have:
    Ott – Analysis of Means-A Graphical Procedure – JQT, 15, pp.10-18, 1983

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