Trying to understand Lavaan input

[Michael Filsecker]

Dear colleagues,

I understand to a sufficient extent how or where do the estimates in lavaan come from. But unfortunately not in the case of the standard errors. How are they calculated or produced? I know that they come from the information matrix, right? and that this information matrix contains first/second order derivatives,right? (derivative with respect to Theta) and that the standard errors are the diagonal of the information matrices, right? Are these derivatives calculated analytically or is a complex iterative numerical process?

Thank you!!

Michael.