Drop certain observation if certain criteria meets a condition (Panel data)

[Hayoung Choi]

Hello!

I have a panel data which consists from the year 2010 to 2019
I want drop all the observations if the observation was not a welfare reciepient in the first year 2010.

the variable names are as follow:
year: year (contitnuous)
welfare recipient: welfare recipient(yes=1/ no=0)

thanks!

[Øyvind Snilsberg]

see #3

[Fei Wang]

bys panelid (year): drop if recipient[1] == 0

[Hayoung Choi]

bys panelid (year): drop if recipient[1] == 0

thank you! the code worked perfectly!