Equality constraints dependent variables PreviousNext
Mplus Discussion > Structural Equation Modeling >
 Nanda Rommelse posted on Monday, September 24, 2012 - 5:16 am

I'm working on a SEM linking parental (M=mothers; F=fathers) autism and ADHD symptoms to perceived stress in the upbringing of their affected (strsFA/strsMU) and unaffected (strsFU/strsMU) offspring, with parental depressive mediating herein.

My model is as follows:

deprF ON adhdF ASDF;
deprM ON adhdM ASDM;

strsFA ON deprF;
strsFU ON deprF;
strsMA ON deprM;
strsMU ON deprM;

strsFA ON adhdF ASDF;
strsFU ON adhdF ASDF;
strsMA ON adhdM ASDM;
strsMU ON adhdM ASDM;

strsFA WITH strsFU;
strsMA WITH strsMU;

adhdM WITH adhdF;
deprM WITH deprF;
strsFA WITH strsMA;
strsFU WITH strsMU;

My main problem is that I can't get Mplus to equalize the correlation between strsFA WITH strsFU on the one hand, and strsMA and strsMU on the other hand. Several of my colleagues working with Mplus also did not get this to work. is this because these are dependent measures and also capture error variance?

Thank you
 Linda K. Muthen posted on Monday, September 24, 2012 - 11:49 am
strsFA WITH strsFU (1);
strsMA WITH strsMU (1);

holds the residual covariances of the two WITH statements equal.
 Nanda Rommelse posted on Tuesday, September 25, 2012 - 12:04 am
I know this is the normal procedure to get this to run, but this doesn't work, nor does the statement

strsFA WITH strsFU (a);
strsMA WITH strsMU (a);

Mplus seems to skip these lines. I don't get an error warning, it simply ignores these lines. If I put another statement on these lines, for example

strsFA ON deprF (a);
strsMA ON deprM (a);

it does work.
 Linda K. Muthen posted on Tuesday, September 25, 2012 - 7:52 am
Please send the relevant outputs and your license number to support@statmodel.com.
Back to top
Add Your Message Here
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Options: Enable HTML code in message
Automatically activate URLs in message