Re: [Gretl-users] how to define a variable
On Thu, 5 May 2011, Sven Schreiber wrote:
I guess it is official that gretl 2.0 will not distinguish between
NA
and NaN etc.? (Just asking.)
Well, I think so. After the lengthy discussion of this (around
April 2010) the conclusion I came to is that it's pretty much
impossible to set up a fully coherent system that encompasses
infinities, NaNs and true "missing data" (NA).
If you're willing to map NA to NaN you can then rely on IEEE
arithmetic to do the right thing with NaNs and infinities, but
otherwise NA doesn't fit in the IEEE scheme and you get insoluble
conundrums in conversion/propagation.
Allin