Re: [Gretl-devel] an Odd example with restrict -- NA as a standard error
On Sun, 18 Nov 2012, Allin Cottrell wrote:
If we were to do this, I'd favour restricting the
"clean-up" to the
standard errors (printing 0 rather than NA) and let the $vcv
accessor show what was actually computed, warts and all.
I think that the flaws from machine precision are of great didactical
value. IMHO, teaching students that 1.2345e-30 is in fact zero and they
should _distrust_ software that writes "0" instead of 1.2345e-30 is part
of teaching good econometrics. That said, in a case like the one Lee
brought up, better to have 0 than NA.
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Riccardo (Jack) Lucchetti
Dipartimento di Economia
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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