rsci_fit: Fit a regime switching cointegration vector error correction...
In EmilNejst/rscivem:

This function takes data

1	rsci_fit(model, data, init_pars, fn_update, ...)

`model`	rsci_model object, the object containing the initial model.
`init_pars`	vector or number, initial parameters for the freely varying elements in beta and the parameters in the probability function.
`fn_update`	function, a function that takes the values from a vector pars and allocates the parameters correctly to the model object. Returns a model object. The function must take the following arguments fn_update(pars, model). These are the free parameters in beta and the probability functions.
`...`	additional information to be passed to optim().