STAN MULAIK wrote:

> I have been conducting further analyses of the reciprocal
> causation case and the notion of correlated errors.  I'm
> leaning now to the view that the covariance component C(u,v)
> between X3 and X4 is not a distinct parameter, but being a
> function of other parameters of the model, is taken into
> account by them.  So freeing up s(u,v) does not allow one
> to take C(u,v) into account.
>
> That undermines my previous argument for freeing up s(u,v).
>
> The nonrecursive case is fraught with complexities.

Multo impressionante. Io comprendeva vermente nihil! Qual falta
de education!

Cellus