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  • Nested Anova questions

    Hello, I would really appreciate your help on nested anova.

    I would like to run a four level-nested anova in stata and my variables are

    Dependent variable: Concentration

    Factor A: Treatment [Two levels: 0, 1]
    Factor B: Day [Five levels: 1, 2, 3, 4, 5]
    Factor C: Animal [Five levels: 1, 2, 3, 4, 5]]
    Factor D: Eye [Two levels: 0, 1 i.e. left vs right eye]

    Basically there are two treatments, 5 days per treatment, 5 animals per day per treatment, 2 eyes per animal.

    I am interested in whether there are significant differences in the mean concentrations of the two treatment groups.
    First of all, is the following command
    correct?

    anova Concentration Treatment / Day|Treatment / Animal|Day|Treatment / Eye|Animal|Day|Treatment/

    When I enter the data, I understand that Variables will be labeled in the following way:
    Factor A: Treatment [0/1 variable]
    Factor B: Day- Do I enter 1,2,3,4,5 OR 1,2,3,4,5,6,7,8,9,10?
    Factor C: Animal-Do I enter 1,2,3,4,5 OR 1,2,3,4,5,....,50?
    Factor D: Eye-Do I enter 0,1 OR 1,2,3,4,5.....,100?

    And a third question, for a four level nested anova, do we need STATA SE instead of STATA IC (mat size larger for STATA SE)?

    If my anova command is correct, and I find a significant result on any levels, is there a posthoc test that i can use after running nested anova?

    Is there any other type of Anova I can use for this type of data?


    Thank you very much in advance

  • #2
    apap,
    welcome to the list (as per FAQ #6, please note the preference on this forum for real full names and take a look at how to re-register accordingly. Thanks):
    as far as posthoc tests (whatever they mean) are concerned, you many want to take a look at -anova postestimation-
    Kind regards,
    Carlo
    (Stata 18.0 SE)

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