[Mediation-information] interpretation for mediation effect

[Weichao Bao]

Dear All,

I have one more question about the interpretation of the Proportion of Total
Effect via Mediation (Average). For example in the following result,
*Proportion of Total Effect via Mediation (Average):*  *-0.1391* 95 % CI
-1.7258  0.8114
Does it mean the 13.91% of total effect is mediated by the mediator? Can
I interpret the proportion here as a percentage?

Thanks a lot.

Sincerely,
Weichao

On Thu, Sep 15, 2011 at 10:55 AM, Weichao Bao <weichaobao at gmail.com> wrote:

> Dear All,
>
>
> I am using the mediation package on my research. The outcome is dichotomous
> and the treatment is continuous. It was run with GAM model.  But I am
> confused with the following results. It shows all the Mediation
> Effect_0, Mediation Effect_1,and Mediation Effect (Average) have significant
> mediation effect based on 95% CI. However, the Proportion of Total Effect
> via Mediation_0, Proportion of Total Effect via Mediation_1, and Proportion
> of Total Effect via Mediation (Average) indicate there is no mediation at
> all based on the 95% confidence interval.  The result is:
>
>
> Mediation Effect_0:  -0.004309 95 % CI  -0.0086640 -0.0007235
>
> Mediation Effect_1:  -0.006557 95 % CI  -0.014173 -0.001015
>
> Direct Effect_0:  0.04452 95 % CI  0.001001 0.112969
>
> Direct Effect_1:  0.04228 95 % CI  0.0009312 0.1061973
>
> Total Effect:  0.03797 95 % CI  -0.004335  0.101359
>
> Proportion of Total Effect via Mediation_0:  -0.1069 95 % CI  -1.592
> 0.817
>
> Proportion of Total Effect via Mediation_1:  -0.1701 95 % CI  -1.8595  0.8059
>
>
> Mediation Effect (Average):  -0.005433 95 % CI  -0.011059 -0.000928
>
> Direct Effect (Average):  0.0434 95 % CI  0.0009659 0.1098405
>
> Proportion of Total Effect via Mediation (Average):  -0.1391 95 % CI
> -1.7258  0.8114
>
>
> Can somebody help me to explain this?
>
>
> Thanks a lot.
>
> Sincerely,
>
>
> Weichao
>
>
>
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