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| Serial-multilevel mediation |
 
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| Message/Author |
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Hi, I'm a new user of Mplus
I have data from a diary study with 4 measurements and 3 mediators. I want to assess serial-mediation at level 1. I'm trying to extend model "I" from Preacher's website and wanted to ask if the following syntax is correct (or if I should use a different model):
VARIABLE: NAMES ARE
ID
X
M1
M2
M3
Y;
USEVARIABLES ARE
ID
X
M1
M2
M3
Y;
CLUSTER IS ID;
MISSING ARE ALL (99);
ANALYSIS: TYPE IS TWOLEVEL RANDOM;
MODEL:
%WITHIN% !
M1 ON X(aw);
M2 ON M2(bw);
M3 ON M2(cw);
Y ON M3 (dw);
Y ON X;
Y ON M1;
Y ON M2;
M3 ON M1;
M3 ON X;
M2 ON X;
%BETWEEN%
X
M1
M2
M3
Y;
M1 ON X(ab);
M2 ON M1(bb);
M3 ON M2 (cb);
Y ON M3 (db);
Y ON X;
Y ON M1;
Y ON M2;
M3 ON M1;
M3 ON X;
MODEL CONSTRAINT:
NEW(indb indw);
indw=aw*bw*cw*dw;
indb=ab*bb*cb*db;
OUTPUT: CINTERVAL SAMPSTAT STDYX; |
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You are expressing one of the indirect effects, namely the one that goes via all 3 mediators. There are other ones.
Note also the typo where you say:
M2 ON M2(bw);
It should be M2 on M1 as you have in on Between. |
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