Mediation (statistics) - Direct Versus Indirect Mediation Effects

Direct Versus Indirect Mediation Effects

In the diagram shown above, the indirect effect is the product of path coefficients "A" and "B". The direct effect is the coefficient "C". The total effect measures the extent to which the dependent variable changes when the independent variable increases by one unit. In contrast, the indirect effect measures the extent to which the dependent variable changes when the independent variable is held fixed and the mediator variable changes to the level it would have attained had the independent variable increased by one unit. In linear systems, the total effect is equal to the sum of the direct and indirect effects (C + AB in the model above). In nonlinear models, the total effect is not generally equal to the sum of the direct and indirect effects, but to a modified combination of the two.

Read more about this topic:  Mediation (statistics)

Famous quotes containing the words effects, direct and/or indirect:

    to become a pimp
    Or deal in fake jewelry or ruin a fine tenor voice
    For effects that bring down the house could happen to all
    But the best and the worst of us . . .
    —W.H. (Wystan Hugh)

    As for your friend, my prospective reader, I hope he ignores Fort Sumter, and “Old Abe,” and all that; for that is just the most fatal, and, indeed, the only fatal weapon you can direct against evil ever; for, as long as you know of it, you are particeps criminis. What business have you, if you are an “angel of light,” to be pondering over the deeds of darkness, reading the New York Herald, and the like.
    Henry David Thoreau (1817–1862)

    Imagination is always the fabric of social life and the dynamic of history. The influence of real needs and compulsions, of real interests and materials, is indirect because the crowd is never conscious of it.
    Simone Weil (1909–1943)