M2 after longitudinal irt

[Makrem Ben Youssef]

hi phil

 

I tried harder to understant the constraints you put on your longitudinal irt example and finally obtain the results but the problem is that when I compute the M2 for each year separately the RMSEA is excellent (below the restrictive cut-off of 0.05) but when I use the panel irt technique the RMSEA is really bad!

 Can I rely on the separate-time-points results or should I report the longitudinal results?

Thanks for your support

Makrem

[Phil Chalmers]

It's difficult to say really, because both pieces of information are useful. Larger models tend to fit worse than smaller models because more can go wrong, so having a larger RMSEA isn't necessarily bad (the 0.05 is only for continuous SEMs, so I would not use it as a the same cutoff here because nothing like that has been established). 

Phil

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