I tabulate on STATA the variables tsmker and age when tsmker is out of the universe
tab tsmker age if tsmker==9
This gives me a high number of people out of the universe for each age. However, I do not understand as all individual more then 15 or 18 years old, depending in the years of the TUS, are in the universe. Why are there that many people not in the Universe at all these ages?
Could you please help me to understand this issue?