Hey!

I'm currently working with the SEM Builder in Stata 16.1 trying to estimate a model including a second-order latent variable (see picture what i'm trying to estimate). The construction of the whole model is based on theoretical arguments and was already tested in slightly different contexts. All the variables (Q3-Q22) are numeric on an ordinal scale (1-5) and there are almost 2000 observations. The majority of the data is either value 3, 4 or 5. From the 9th iteration, the log likelihood doesn't change anymore and all the values are 'not concave'. In addition, many standard errors are missing and i don't know how to fix this (i don't know how to make the parameters identified) and couldn't figure it out through Google/YouTube/reddit/Stata manuals. Does anybody have an idea on how to continue with this?

Any help is appreciated, thanks!

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