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Including a covariate can increase power to detect an effect between two variables. Although previous research has studied power in mediation models, the extent to which the inclusion of a mediator will increase the power to detect a relation between

Including a covariate can increase power to detect an effect between two variables. Although previous research has studied power in mediation models, the extent to which the inclusion of a mediator will increase the power to detect a relation between two variables has not been investigated. The first study identified situations where empirical and analytical power of two tests of significance for a single mediator model was greater than power of a bivariate significance test. Results from the first study indicated that including a mediator increased statistical power in small samples with large effects and in large samples with small effects. Next, a study was conducted to assess when power was greater for a significance test for a two mediator model as compared with power of a bivariate significance test. Results indicated that including two mediators increased power in small samples when both specific mediated effects were large and in large samples when both specific mediated effects were small. Implications of the results and directions for future research are then discussed.
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    Title
    • Mediation as a novel method for increasing statistical power
    Contributors
    Date Created
    2013
    Resource Type
  • Text
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    Note
    • thesis
      Partial requirement for: M.A., Arizona State University, 2013
    • bibliography
      Includes bibliographical references (p. 50-53)
    • Field of study: Psychology

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    by Holly Patricia O'Rourke

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