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  • A statistics question

    Dear Biomch-L community,

    In my studies, I need to test homoscedasticity(or homogeneity of
    variances) of different groups. However, commonly used test methods
    (Bartlett's test, Levene test and Brown-Forsythe test) are designed to test
    effects of only one independent variable on the outcome variability. Are
    there any other statistic methods that can be conducted to test the effects
    of two independent variables in homoscedasticity analysis? We are looking
    for a method analogous to a 2-factor ANOVA, that can be used to test
    (compare) the variability in several groups.

    Thanks in advance.

    Yang Xu

    Biomechanics Lab
    Department of Kinesiology
    The Pennsylvania State University

  • #2
    Re: A statistics question

    Starting here might help. Sorry but I'm at home and don't have access to the paper.

    http://www.sciencedirect.com/science...67947383900622

    Comment


    • #3
      Re: A statistics question

      Thank you very much!
      That helps a lot.

      Yang Xu



      Originally posted by gwhite43 View Post
      Starting here might help. Sorry but I'm at home and don't have access to the paper.

      http://www.sciencedirect.com/science...67947383900622

      Comment


      • #4
        Re: A statistics question

        That is what I am looking for. Thanks

        Comment


        • #5
          Re: A statistics question

          Originally posted by xyang41 View Post
          Dear Biomch-L community,

          In my studies, I need to test homoscedasticity(or homogeneity of
          variances) of different groups. However, commonly used test methods
          (Bartlett's test, Levene test and Brown-Forsythe test) are designed to test
          effects of only one independent variable on the outcome variability. Are
          there any other statistic methods that can be conducted to test the effects
          of two independent variables in homoscedasticity analysis? We are looking
          for a method analogous to a 2-factor ANOVA, that can be used to test
          (compare) the variability in several groups.

          Thanks in advance.

          Yang Xu

          Biomechanics Lab
          Department of Kinesiology
          The Pennsylvania State University
          Just joined BIOMCH-L and saw your post. You might like to check out this paper:

          Herbert RD, Hayen A, Macaskill P, Walter SD. Interval estimation for the difference of two independent variances. Communications in Statistics - Simulation and Computation. 2011; 40: 744-58.

          If you don't have access I can send you a pdf copy - just contact me on rherbert@george.org.au.

          Rob Herbert

          Comment

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