Set of files derived from the 1985 and later national American Housing Survey (AHS) and the 2002 and later Metro AHS. Categorizes housing units by affordability and households by income, with respect to the Adjusted Median Income, Fair Market Rent (FMR), and poverty income. It also includes housing cost burden for owner and renter households. These files have been the basis for the worst case needs tables since 2001. ICPSR has 2002 and 2004 only. The site also has a quick lookup feature.