Am 24.07.2018 um 16:18 schrieb Allin Cottrell:

Following discussions between Jack and myself, here's a sort of
"RFC" for changing the internal definition of "NA" in gretl, which we believe can be done with full backward compatibility.

Yes, I think "nice feature but we don't have it currently" is about right. Consider the following (abdata has lots of missing values, including the very first observation):

<hansl>
open abdata.gdt
WAGE[1] = WAGE[1] * 0

The first "print" shows that the leading NA for WAGE has indeed been changed to 0 (defensibly).

Under the proposed scheme NAs (= nans) would not turn into zeros on multiplication by zero -- but the misszero() function would still be available to do that job.