Starting values

The sem_fit function has a keyword argument that takes either a vector of starting values or a function that takes a model as input to compute starting values. Current options are start_fabin3 for fabin 3 starting values ^{[Hägglund82]} or start_simple for simple starting values. Additional keyword arguments to sem_fit are passed to the starting value function. For example,

    sem_fit(
        model; 
        start_val = start_simple,
        start_covariances_latent = 0.5
    )

uses simple starting values with 0.5 as a starting value for covariances between latent variables.