I am compiling summary statistics on a sample of mothers (identified using the CHBORN variable) from the South African 2001 Census and 2007 Community Survey. I am unclear how I should apply weights to my variables of interest.

I understand that I should use the WTPER for all individual-level variables (e.g. age, personal income, etc.). Since I am reporting the summary statistics for mothers (not households) what weighting variable should I use for my household-level variables of interest (household income, number of persons in house, ownership of dwelling, single-parent household)? I think it should be the WTHH weight, but I’m a bit confused here.

Also, should the number of observations change when I apply the weights? I added the WTPER to the weight statement in my SAS procedure, but the number of observations is the same as if the weight statement was not there. Does the weighting variable only adjust the mean/standard deviation/frequency?

Thank you for any clarification.