Moderated Mediation with nonlinear in... PreviousNext
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 Jenny Swanson posted on Wednesday, March 09, 2011 - 8:03 pm
I will be testing a moderated mediation model with the approach described in Preacher, Rucker & Hayes (2007) in Figure 2 model 5 where W influences both indirect paths of the model.

For testing model 5, I have determined my Mplus code should be similar to the below code. However, I am unsure what (if any) modifications are necessary to test the nonlinear interaction involving the moderator? I am just beginning to use Mplus, but I have used other SEM software in the past.

Many Thanks,
Jenny


ANALYSIS: BOOTSTRAP = 1000;

MODEL:
M WITH MW;
M ON X (a1)
W
XW (a3);
Y ON M (b1)
X W XW
MW (b2);

MODEL CONSTRAINT:
NEW(eff1 eff2 eff3);
eff1=(a1+a3*.42)*(b1+b2*.42);
eff2=(a1+a3*.53)*(b1+b2*.53);
eff3=(a1+a3*.64)*(b1+b2*.64);
OUTPUT: CINTERVAL(bcbootstrap);

...where .42, .53, and .64 are example values of W at which I want conditional indirect effects.
 Bengt O. Muthen posted on Thursday, March 10, 2011 - 2:20 pm
I haven't read that paper, but Kris Preacher tells me he thinks your code looks correct.
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