MODEL INDIRECT or MODEL CONSTRAINT? PreviousNext
Mplus Discussion > Structural Equation Modeling >
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 Jinni Su posted on Friday, September 27, 2013 - 1:33 pm
Hello,

I want to examine a SEM model where X is hypothesized to influence Y through multiple indirect pathways that involve multiple mediators. Specifically, it is hypothesized that:

X-->M1-->Y
X-->M2-->Y
X-->M1-->M3-->Y
X-->M2-->M3-->Y
X-->M1-->M2--M3-->Y

How do I specify a model to examine all the specific indirect effects and total indirect effects of X on Y? Are the following commands correct?

MODEL INDIRECT:
Y IND M1 X;
Y IND M2 X;
Y IND M1 M3 X;
Y IND M2 M3 X;
Y IND M1 M2 M3 X;
Y IND X;

Or should I use MODEL CONSTRAINT instead?

MODEL CONSTRAINT:
NEW(XM1Y XM2Y XM1M3Y XM2MM3Y XM1M2M3Y);
XM1Y = XM1 * M1Y;
XM2Y = XM2 * M2Y;
XM1M3Y = XM1 * M1M3 * M3Y;
XM2M3Y = XM2 * M2M3 * M3Y;
XM1M2M3Y = XM1 * M1M2 * M2M3 * M3Y;

How do I obtain total indirect effects of X on Y if I use MODEL CONSTRAINT?

Thanks!
Jinni
 Linda K. Muthen posted on Saturday, September 28, 2013 - 6:39 am
If you say

MODEL INDRIECT:
y IND x;

you will obtain tests for all indirect effects from x to y.

If this is not available, I need to know more about the scales of your variables.
 Jinni Su posted on Sunday, September 29, 2013 - 7:50 am
Thank you very much! I think this will work.
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