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I wish identify cross-sections in a panel data set if their value for a series at a certain time equals NA. I thought of something like However, some cross sections of series_a are still being displayed besides having numeric value. Anything wrong with the sampling command?

where time is the date you are interested in.

I do not know if I can adopt that suggestion for what I need. My problem is a little more complex. In my pseudo-code below it should be something like I do not know if I can achieve that sampling with your suggestions.

I don't follow.

I have a panel data set which contains monthly data for several years. However, I am primarily interested in two specific periods (before and after some policy change). Hence, I set the sample to these two periods:
Additionally, I need to check how many of my cross sections have NAs in one period but not in the other period. Therefore: Since does not work, I replaced it with the corresponding obsid. Suppose that 2012m01 is the 12th month in my sample, i.e.

For that specific case, I'd do:

But that does not allow me to look at the value of series_a in 2012m01. Is there any way to use a particular date as an index for a series (i.e., what I try to do with series_a(@obsid=12)?

No.

I still don't see what you're trying to do. If you just want a count,why do you need to see the series?

Because I need to know the value of series_a in the other period, i.e. when it is not NA