Is there an arbitrary way of choosing the duration of longitudinal data?

[Michael Duarte Goncalves]

Hi Statalist Community,

I am currently working with so-called longitudinal variables. I would like to know if it is possible to extend a longitudinal dataset over time using stata, even if this generates a lot of missing data and/or 0 values.

For example, in my case, I would like the time variable to start in January 2005 and end in December 2010. Is there a way of doing this, please?

Here's a small sample:

* Example generated by -dataex-. For more info, type help dataex
clear
input str31 municipio str22 province long cmunine int date double(date_quarterly power power_solar power_wind power_hydro) long power_biomass double(cumpower_solar cumpower_wind)
"Campello (el)" "Alicante/Alacant" 3050 548 182   0   0 0 0 0   15 0
"Campello (el)" "Alicante/Alacant" 3050 549 183 1.4 1.4 0 0 0 16.4 0
"Campello (el)" "Alicante/Alacant" 3050 550 183   0   0 0 0 0 16.4 0
"Campello (el)" "Alicante/Alacant" 3050 551 183   0   0 0 0 0 16.4 0
"Campello (el)" "Alicante/Alacant" 3050 552 184   0   0 0 0 0 16.4 0
end
format %tm date
format %tq date_quarterly

Thank you very much in advance for your time and help!
Best,

Michael

[Michael Duarte Goncalves]

I received an excellent answer about it in another recent post.
Thank you all the same for your support and dedication!

Here is the link, for those interested:

https://www.statalist.org/forums/for...80#post1751780

Lovely day to all of you.

Michael