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 Marcus Butts posted on Friday, June 09, 2006 - 3:56 pm
I've got two quick (and easy) questions that I can't find the answer to in Klien & Moosebrugger or the Mplus manual.

First, is it necessary to center your variables when using the Mplus/QML approach for intearctions?

Second, are you supposed to allow for the covariation between the latent variables comprising your intearcation term? For example, would I say:

FCOM | FORMAL XWITH COMM;
FORMAL WITH COMM*.375;

OR WOULD I CONSTRAIN THE COVARIANCE TO BE ZERO AS FOLLOWS:

FORMAL WITH COMM@0;


Thanks.
 Linda K. Muthen posted on Monday, June 12, 2006 - 8:09 am
It is not necessary to center your variables when using the XWITH command. You should not mention the covariance between the two variables that are part of the interaction. Because these are covariates, the model is estimated conditioned on these variables. Their covariance is not estimated as part of the model. If you want to know the value, you can obtain it using TYPE=BASIC;.
 courtney bagge posted on Tuesday, November 15, 2011 - 9:57 am
Hi there. I am conducting an analysis where I model an interaction between two latent continuous variables (A and B) in the prediction of an observed continuous variable. I noticed that I am unable to specify a correlation between the main effects and the interaction (e.g., A with interaction and B with interaction). Is there someway that I can find out what the correlation would be. I appreciate any help that you can provide. Thanks.
 Linda K. Muthen posted on Wednesday, November 16, 2011 - 2:22 pm
You cannot have this parameter in the model. You can however derive this value. See the Aiken and West book Multiple Regression: Testing and Interpreting Interactions starting on page 178.
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