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Overview Direct effect Indirect effect Mediation Analysis Demonstration using AMOS Siny Tsang, M. A. University of Virginia November 28, 2013 S. Tsang 1 of 14 [email protected]
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  • Overview Direct effect Indirect effect

    Mediation AnalysisDemonstration using AMOS

    Siny Tsang, M. A.University of Virginia

    November 28, 2013

    S. Tsang 1 of 14

    [email protected]

  • Overview Direct effect Indirect effect

    About this demonstration

    I In this demonstration, the analysis procedures areperformed using IBM SPSS AMOS 21

    I AMOS is an add-on to the IBM SPSS program, which canbe activated from SPSS > Analyze > IBM SPSS AMOS.

    I The example in this demonstration uses theMediation.sav dataset.

    I Screenshots of the analysis procedures are provided, but Iwould encourage you to run the analyses yourself to followalong.

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  • Overview Direct effect Indirect effect

    Mediation

    I The concept of mediation (or indirect effect) implies acausal hypothesis where an independent variable causes adependent variable, through its effect on a mediatingvariable (Sobel, 1990).

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  • Overview Direct effect Indirect effect

    Drawing in AMOSThe symbols

    Observed variable

    Unobserved variable

    Regression

    Variance

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  • Overview Direct effect Indirect effect

    Drawing in AMOSThe functions

    I Left click to activate a toolbar functionI Left click, hold + drag to draw

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    Direct effectPredict youth delinquency from peer delinquency

    I Draw the pathdiagram in AMOS

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    Direct effectPredict youth delinquency from peer delinquency

    I Click CalculateEstimates, or CTRL+ F9

    I Click View theoutput pathdiagram

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  • Overview Direct effect Indirect effect

    Resultsfrom Analysis Output

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  • Overview Direct effect Indirect effect

    Indirect effectIs there an indirect effect via Partner Delinquency?

    I Click CalculateEstimates, or CTRL+ F9

    I Click View theoutput pathdiagram

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  • Overview Direct effect Indirect effect

    Indirect effectIs there an indirect effect via Partner Delinquency?

    I Click CalculateEstimates, or CTRL+ F9

    I Click View theoutput pathdiagram

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  • Overview Direct effect Indirect effect

    Resultsfrom Analysis Output

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    Comparing the direct & indirect effects

    Direct Effect Indirect Effect

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    Suggested readings

    I A very thoughtful book on multiple regression &interactions (Aiken & West, 1991)

    I One of the most cited papers about mediation models(Baron & Kenny, 1986)

    I A cautionary tale about mediation (Cole & Maxwell, 2003)

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    Comments

    I The example in this demonstration uses artificial data. Thedata and findings do not represent actual research findingsnor the authors personal opinions.

    I If you have any questions regarding the materialspresented, please email your questions to:

    Siny Tsangst2sb[at]virginia.edu

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    OverviewDirect effectIndirect effect