I am getting confusing results for counts of people not in universe, and I am writing to try and figure out if it is my code or my understanding at fault.
I see in most recent years NIUs for inctot of between 22 and 25 percent. These are raw counts, unweighted. In the late 60s and early seventies the NIUs are higher, generally between 25 and 30. I am guessing that most of these people are children, and that the rise in the sixties is the baby boom.
But then I see numbers of zero or close to zero in 1964-7. OK, that’s because children are not reported in those years, so they do not show up as out of universe. But then the NIU countt jumps back up to 33 percent in 1963. Are those the people in rotation groups 4 or 8? How should we deal with these people? Are their wtsupp’s zeroed out? If not, should I zero them out? Are the remaining individual weights adjusted so that they represent the entire population? Do you know why these groups were not included?