Interaction between continuous latent... PreviousNext
Mplus Discussion > Structural Equation Modeling >
Message/Author
 Rachel posted on Tuesday, November 01, 2016 - 11:39 am
Dear Dr. Muthen,

When I try to model an interaction between 2 latent variables, rather than appear as a dot between the 2 & my endogenous variable, it appears on the path diagram as a 3rd latent variable, in line with the 2 variables used to create it.
1) Is this reflecting that the model is doing something different than what I intend?
2) If so, how should I change my code (below) to get the interaction to appear as a dot between the 2 exogenous variables?

ANALYSIS:
TYPE = RANDOM;

ALGORITHM = INTEGRATION;
MODEL:

EXUBER54 by
f55aq9
f55aq37
f55aq44
f55aq59 f55aq64 ;
F55AQ44 WITH F55AQ37;
F55AQ59 WITH F55AQ44 ;


EFFCONT by
f55a11r
f55aq29
f55a35r
f55a40r
f55aq54
f55aq72
f55a15r
f55a19r
f55aq47
f55a66r
f55a78r;
F55AQ54 WITH F55A11R ;
F55A78R WITH F55A66R ;
F55A11R WITH F55AQ47 ;
F55A40R WITH F55A35R ;
F55AQ72 WITH F55AQ29 ;
F55AQ29 WITH F55A19R ;

SUM_WJR ON EXUBER54 EFFCONT;
EXUxEFTC | EXUBER54 xwith EFFCONT;
SUM_WJR ON EXUxEFTC;

I've tried to model it based on the code in page 71 of the user guide, but instead of my interaction appearing as a dot between the 2 variables and the endogenous, it's appearing as a 3rd latent variable also predicting it.

Thank you!!
 Rachel posted on Tuesday, November 01, 2016 - 1:46 pm
P.S. This is what my path diagram currently looks like:
https://iu.box.com/s/o0rl7blshyexlhkxc5fenihdys2m839o
I am concerned that this model might not reflect my research question, since the placement of the interaction term is not where I would expect.
 Bengt O. Muthen posted on Wednesday, November 02, 2016 - 5:15 pm
It is fine - you can re-draw it with a dot if you like that better. The analysis is doing what you want.
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