Data Dictionary:  Census 2000 
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Survey: Census 2000
Data Source:  U.S. Census Bureau and Social Explorer 
Data set: Social Explorer Tables (SE)
Table:  T100. Median Nonfamily Household Income In 1999 Dollars [1] 
Universe: Nonfamily Households
Table Details
T100.  Median Nonfamily Household Income In 1999 Dollars  
Universe: Nonfamily Households  

Relevant Documentation:
Excerpt from:  Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002. 
Summary File 3 Technical Documentation > Appendix B. Definitons of Subject Characteristics > Population Characteristics > Income in 1999 > Income Type in 1999 > Median income 
The median divides the income distribution into two equal parts: onehalf of the cases falling below the median income and onehalf above the median. For households and families, the median income is based on the distribution of the total number of households and families including those with no income. The median income for individuals is based on individuals 15 years old and over with income. Median income for households, families, and individuals is computed on the basis of a standard distribution (see the "Standard Distributions" section under "Derived Measures"). Median income is rounded to the nearest whole dollar. Median income figures are calculated using linear interpolation if the width of the interval containing the estimate is $2,500 or less. If the width of the interval containing the estimate is greater than $2,500, Pareto interpolation is used. (For more information on medians and interpolation, see "Derived Measures".)
Excerpt from:  Social Explorer, U.S. Census Bureau; 2000 Census of Population and Housing, Summary File 3: Technical Documentation, 2002. 
Summary File 3 Technical Documentation > Appendix B. Definitons of Subject Characteristics > Population Characteristics > Household Type and Relationship > Family Type > Other family > Nonfamily household 