http://spssx-discussion.165.s1.nabble.com/Multiple-Mediation-using-3-Mediators-tp5713461p5713477.html
I would argue to include all three since leaving one out bias other parameter estimates in the model.
> Hi,
>
> I wonder can you help me out, I think this is a reasonably easy question but
> I am a novice in the area of multiple mediation and I haven't been able to
> figure this problem out.
>
> I have three hypothesised mediators M1, M2, and M3 which I argue will
> mediate the relationship between two independent variables and my dependent
> variable (N=192). I ran simple mediation models for each of these mediators
> (without controlling for the effects of the other mediators) and found that
> M1 fully mediated the effect of IV1 and IV2 on DV. M2 fully mediated the
> effect of IV1 on DV and partially mediated the effect of IV2 on DV. For M3 -
> no mediation was found.
>
> When I enter the three mediators into Preacher and Hayes' (2008) INDIRECT, I
> found that both M1 and M2 mediated the link between IV1 and DV whilst as
> expected no mediation was found for M3. For IV2 no mediation effect was
> found for any of the mediators. I am okay with making theoretical
> conclusions on this findings. However, given that I found full mediation for
> M1 and partial mediation for M2 on the effect of IV2 on DV when I ran simple
> mediation models should I report this information also? Or just report the
> multiple mediation findings using INDIRECT. I would like to show the
> mediation effect of M1 and M2 for IV2 however is this poor practice... I'm
> not sure.
>
> Also when I tested the simple mediation for M3 I initially decided to
> include only M1 and M2 in INDIRECT, however this caused the bootstrap result
> for M2 to reduce to insignificance. Should I include all three hypothesised
> mediators on INDIRECT or just the two that had significant mediation in the
> simple mediation tests?
>
> Best Wishes and Thanks,
> Rachel.
>
>
> --
> View this message in context:
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