model convergence

[brandmaier]

I am looking for a standardized way to get a status of convergence. Can I do something like converged(fitted) that returns a boolean? This is important for simulation studies.

[brandmaier]

I understand that this is optimizer-dependent. Still, couldn't we implement a default way to access the Optim result status for standard models?

[Maximilian-Stefan-Ernst]

The SemFit object is currently documented as

help?> SemFit
search: SemFit SemFIML Sem edit SemML SemRidge @edit Set SemWLS exit

  SemFit

  Fitted structural equation model.

  Interfaces
  ≡≡≡≡≡≡≡≡≡≡

    •  minimum(::SemFit) -> minimum objective value

    •  solution(::SemFit) -> parameter estimates

    •  start_val(::SemFit) -> starting values

    •  model(::SemFit)

    •  optimization_result(::SemFit)

    •  algorithm_name(::SemFit) -> optimization algorithm

    •  n_iterations(::SemFit) -> number of iterations

    •  convergence(::SemFit) -> convergence flags

    •  converged(::SemFit) -> convergence success

so the function "converged" is what you are looking for. This relies on the flags of the used backend, and might be different for each backend. Other convergence properties has to be computed manually atm (heywood cases, for example).

[brandmaier]

Perfect! Thanks, @Maximilian-Stefan-Ernst