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)
Universe: Nonfamily Households
Variable Details
T101.  Average NonFamily Income In 1999 Dollars  
Universe: Nonfamily Households  
T101_001Average nonfamily income In 1999 Dollars
Percent base:
None  percentages not computed
Formula used to compute this variable:
if( SF3:P013011 == 0)
Return_Value.IsNull = true;
else
Return_Value = SF3:P081001 / SF3:P013011;

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 > Mean income 
Mean income is the amount obtained by dividing the aggregate income of a particular statistical universe by the number of units in that universe. Thus, mean household income is obtained by dividing total household income by the total number of households. (The aggregate used to calculate mean income is rounded. For more information, see "Aggregate income.")
For the various types of income, the means are based on households having those types of income. For households and families, the mean income is based on the distribution of the total number of households and families including those with no income. The mean income for individuals is based on individuals 15 years old and over with income. Mean income is rounded to the nearest whole dollar.
Care should be exercised in using and interpreting mean income values for small subgroups of the population. Because the mean is influenced strongly by extreme values in the distribution, it is especially susceptible to the effects of sampling variability, misreporting, and processing errors. The median, which is not affected by extreme values, is, therefore, a better measure than the mean when the population base is small. The mean, nevertheless, is shown in some data products for most small subgroups because, when weighted according to the number of cases, the means can be added to obtained summary measures for areas and groups other than those shown in census tabulations. (For more information on means, see "Derived Measures".)
For the various types of income, the means are based on households having those types of income. For households and families, the mean income is based on the distribution of the total number of households and families including those with no income. The mean income for individuals is based on individuals 15 years old and over with income. Mean income is rounded to the nearest whole dollar.
Care should be exercised in using and interpreting mean income values for small subgroups of the population. Because the mean is influenced strongly by extreme values in the distribution, it is especially susceptible to the effects of sampling variability, misreporting, and processing errors. The median, which is not affected by extreme values, is, therefore, a better measure than the mean when the population base is small. The mean, nevertheless, is shown in some data products for most small subgroups because, when weighted according to the number of cases, the means can be added to obtained summary measures for areas and groups other than those shown in census tabulations. (For more information on means, 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 