I work on the Brazilian 1980 census.
I have already asked a question about the household weight variable WTHH having some values equal to zero. Tim Morelan replied to me that it was because household questions were asked only of those living in “permanent private households.” So some individuals are included in the person-level analysis but not in household-level one. This makes sense.
My question is now about the individual weight variable WTPER. I have noticed that 10 individuals had a value zero for WTPER. This does not make sense to me. Can you tell me the reason why these individuals are excluded from the person-level analysis?
Thanks a lot for your help.