This U.S. Census report divides the nation’s 106 million households into quintiles of 21.3 million based on income and compares their characteristics and their movements between and within the quintiles. Using data from the Survey of Income and Program Participation (SIPP), the report traces the changing income levels of a representative sample of U.S. residents over a 48-month period (February 2004 to January 2008). These households were interviewed every four months over this time.
View the full report in PDF format at: http://www.census.gov/prod/2011pubs/p70-124.pdf