Serial mediation in path analysis PreviousNext
Mplus Discussion > Structural Equation Modeling >
 Sabahat Cigdem Bagci posted on Friday, January 12, 2018 - 12:59 am
Hello, I have a path model with 2 consecutive mediators. So I have such a partially mediated model:
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?
 Bengt O. Muthen posted on Friday, January 12, 2018 - 5:10 pm
Try bootstrapping and look at these confidence intervals instead. See e.g. the Table 2.21 input shown for our book at

Also, perhaps your mediation model does not fit well so that the estimates are not meaningful.
 Sabahat Cigdem Bagci posted on Monday, January 15, 2018 - 10:35 pm
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.
 Bengt O. Muthen posted on Tuesday, January 16, 2018 - 2:29 pm
CIs can always be used, so also for direct effects.
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