Assigns a code for neighborhood poverty level based on the census tract of diagnosis address. Cases diagnosed between 1995 and 2004 are assigned a code based on the 2000 U.S. Census, the last decennial census for which poverty level was collected. Cases diagnosed since 2005 are assigned a code based on the American Community Survey (ACS). Codes may be automatically assigned by running the Poverty and Census Tract Linkage Program available through the Data Analysis Tools section of the NAACCR website.