Hi there!
I'm exploring Onyx with great interest as a possible recommendation to my students (instead of AMOS).
In order to familiarize myself with Onxy, I am comparing the results of the Tutorial CFA example with those from AMOS and Mplus. The results in AMOS and Mplus are very similar to each other. Results in Onyx are similar for parameter estimates, but very different for model fit.
It appears that Onyx is calculating the degrees of freedom differently.
In the example, there are three indicators [for which I added one latent factor]. If I remember correctly, that should give me 6 observed (co-)variances: 3*(3+1)/2 = 6. However, Onyx tells me that there are "Observed Statistics: 9.0".
Consequently, the model isn't just-identified (as I expected), but has 3 df.
Why is that the case? Is there a way to make these settings more comparable across software packages?
Any help would be greatly appreciated!
Heiko