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Mplus Discussion > Structural Equation Modeling >
 Jtte posted on Thursday, February 19, 2009 - 7:14 pm

Have been trying to use the script as posted on your website for calculation of saturated statistics and test assumptions with twins (sex limitation model).

I have modified the script slightly in that I have reduced the number of zygosity groups from 6 to 5 but otherwise it is similar.

Have run into a problem in that the script will not run. Error message tells me that the variance of some of the variables (sex variables for twin 1 and twin 2 within each zygosity group) are zero. This is what I would have expected as the groups represent zygosity/ sex groups and must therefore have been the same in the example shown on the website.

I'm using version 5.0 and I think the website example is run on version 5.2

Any thoughts you have on what might be happening would be appreciated.

 Linda K. Muthen posted on Friday, February 20, 2009 - 10:54 pm
In the example on the website, the groups do have some variability on gender which they probably should not. In your case, do not use gender as a covariate because it has no variability within groups.
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