In the IPUMS-CPS, for income variables that are the sum of other income variables, such as INCTOT, HHINCOME, and FTOTVAL, I notice that you do not provide top-coding thresholds or replacement values. Do you have a recommended procedure for recognizing whether one of these values has been affected by top-coding?
How do the summing variables relate to the top-coded components? In the years before 1996, is the summary value created by summing the components, treating top-coded values as if they earned the top-codeing threshold? In the years from 1996 to 2010, are they summed as if the top-coded value were replaced by the mean?