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Thread: ANOVA test

  1. #1 ANOVA test 
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    When running a single factor ANOVA test, do the number of subjects, (sample sizes) have to be equal?
    Can one column have more data than the other twos?

    Or can i randomly choose 50 individuals from the dataset that has 100, 51, 67 individuals for each column in order to run the test?


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  3. #2  
    Forum Radioactive Isotope MagiMaster's Avatar
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    (Again not a statistician but) I don't think they have to be equal. While you can use the random subsampling you mentioned, I think using the full set and the appropriate adjustments will give better results. [GraphPad Statistics Guide]


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  4. #3  
    Forum Professor jrmonroe's Avatar
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    I (also not a statistician) likewise believe that the sample sizes don't need to be equal. For questions such as this, if you google, say, ANOVA N1 N2, you might find your answer in the results.
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  5. #4  
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    Thanks for the respones. yes you are all right.

    I found that in my textbook (statistics in kinesiology by vincent & Weir) that they dont need to have the same number of n as long as the samples are normally distributed and have equal or nearly equal variabilities.
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