Re: Nested ANOVA

From: jwalla (john_wallace_at_affymetrix.com)
Date: 11/19/04

  • Next message: Bruce Weaver: "Re: Nested ANOVA" 
    Date: 19 Nov 2004 12:12:32 -0800

    Thanks for your reply, Bruce. Maybe I can clarify what I think you
    mean with an example:
    In a nested study, the researcher wants to identify the effect of a
    teaching technique on standardized test scores for students. She picks
    one school with two classrooms for the control technique and another
    school with two classrooms for the test technique (with identical
    numbers of idealized, homogenous students, naturally). Since students
    in this example cannot simultaneously be members of more than one
    classroom, students are nested within classroom for the purpose of
    analyzing the data.

    In a repeated measures version of the test, you'd only need one school,
    and your populations would consist of the same students before and
    after exposure to the teaching technique. In that case, you wouldn't
    need to nest the students in classrooms, since the independent variable
    (teaching technique) has nothing to do with how the students are
    grouped?

    Naturally there's all kinds of confounding that would need to be
    controlled for in a real study like that, but for the purpose of
    discussing grouping of replicates and nesting terms is my example
    accurate?

  • Next message: Bruce Weaver: "Re: Nested ANOVA"

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