On Mon, 2 Jun 2008, Talha Yalta wrote:
When you get a warning like that, you are supposed to do something
about it not ignore it. Do you want to get the correct result or some
result correct or not?
It may well happen, during an iterative procedure (like mle for example)
that an attempt is made to compute, say, the log of a negative number. In
these cases, the warning could be transient, if in the end the algorithm
converges.
Riccardo (Jack) Lucchetti
Dipartimento di Economia
Università Politecnica delle Marche
r.lucchetti(a)univpm.it
http://www.econ.univpm.it/lucchetti