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Serial mediation in path analysis |
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Hello, I have a path model with 2 consecutive mediators. So I have such a partially mediated model: X->M1->M2->Y When I look at model results, Y is not significantly predicted by X, M1, or M2. But when I look at indirect effects with 95% CI intervals, it seems like the indirect paths of X->M1->Y and X->M1->M2->Y are significant. What may be the reason? Should I assume that the mediation is significant even though the mediators do not predict the outcome variable? Thanks |
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Try bootstrapping and look at these confidence intervals instead. See e.g. the Table 2.21 input shown for our book at http://www.statmodel.com/mplusbook/chapter2.shtml Also, perhaps your mediation model does not fit well so that the estimates are not meaningful. |
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Hello, thanks for the answer. The fit of the model is good. So when I look at bootstrapped results for the direct effects, it seems like I have a significant path from the mediator to the outcome. Is it ok to report the CI for the significance of direct effects? When I look at papers, I usually see point estimates and significance level for direct effects, and CI's used for the indirect effects. |
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CIs can always be used, so also for direct effects. |
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