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MGA analysis for Serial Mediation model

Posted: Fri Aug 23, 2019 10:55 am
by lilyv
Hi,

My serial mediation model is presented in the graph model below. It has 2 mediation effects : X -> M1 -> Y and X -> M1 -> M2 -> Y.
I intend to run PLS-MGA to see if there is different between 2 groups of clients.

The results of Indirect effects in PLS-MGA are about the indirect effect from X to Y and from X to M2. In this case, how to interpret it ?

Could anyone give me some instructions or guideline to analyze this kind of model ?

Many thanks.

Re: MGA analysis for Serial Mediation model

Posted: Tue Aug 27, 2019 11:09 am
by jmbecker
Could you be a bit more specific about your problem? What exactly is unclear in the interpretation of the effects?

Re: MGA analysis for Serial Mediation model

Posted: Tue Aug 27, 2019 1:18 pm
by lilyv
Dear Mr. Becker,

Actually my question is about how to interpret the PLS-MGA results showed in "Indirect effects" section ?

In the case of direct effect (ex : from X to Y), we can see whether this path coefficient if significantly larger in the first group than in the 2nd group.
In my model, we have two cases of indirect effect : from X -> M1 -> Y and from X-> M1 -> M2 -> Y. The PLS-MGA result only shows the indirect effect from X -> Y : Path-coeff. difference groups = 0.086; p-value = 0.084.

Best regards,

Re: MGA analysis for Serial Mediation model

Posted: Tue Aug 27, 2019 6:27 pm
by jmbecker
The PLS-MGA currently does not include specific indirect effects, but only total indirect effects. We will add specific indirect effects in the next release.