Am 21.12.2020 um 16:37 schrieb Filipe Costa:
 Hi community!
 I'm trying to compute a time-varying state space model to calculate
 stocks' betas. Unfortunately, I have some *missing observations* and,
 when this is the case, the model implemented by Gretl suddenly stops and
 doesn't compute anything (as expected). My question is simple: *Is there
 a way of instructing Gretl to ignore missing values and compute the
 state spacel model?*
 Here is the example code taken from chapter 35 of Gretl manual. Please
 note that I added line 6 "*INFQ[20] = NA*" in order to have a missing
 data point in the data. 
Hi Filipe, I would suggest to take a look at Jack's (Lucchetti) article
in the JSS a few years back, "State Space Methods in Gretl", although
I'm not sure if that is the latest available version.
In some places I think he simply put in a misszero() conversion, but
only he can tell whether that was really the key.
cheers
sven