Am 19.07.2016 um 22:53 schrieb Allin Cottrell:
On Tue, 19 Jul 2016, Sven Schreiber wrote:
> However, the resulting interaction series have valid entries where the
> original series had missings (beyond the latest available obs), but
> only where the interaction effect would be "active" (=non-zero).
(Sorry, I meant it the other way around...)
> For example, the interaction of x with January would have a
> obs 2016:1 but would be zero for 2016:2, although x has a missing at
> both of these obs.
(... namely like in this example.)
In gretl, we stipulate that zero times NA is zero (which, I have
makes sense so laong as "NA" means unobserved, not an arithmetical
pathology such as NaN or infinity). But if this case is going beyond
that stipulation then I suppose it is a bug.
Right, now I remember some discussions about this. This is actually a
case that follows that stipulation.