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Data Dictionary: ACS 2011 (5-Year Estimates)
you are here: choose a survey survey data set table variable details
Data Source: Social Explorer; U.S. Census Bureau
Universe: Housing units
Variable Details
A10057. Median Year Structure Built
Universe: Housing units
A10057_001Median Year Structure Built
Percent base:
None - percentages not computed
Aggregation method:
Median, using bracket table: B25034, interpolation method: Linear
Formula used to compute this variable:
Return_Value = ACS11_5yr:B25035001; if (ACS11_5yr:B25035001.IsNull) Return_Value.IsNull = true
Variables used in the formula:
ACS11_5yr:B25035001
Housing Units: Median Year Structure Built
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2007-2011 Summary File: Technical Documentation.
  The 2007-2011 ACS 5-Year Summary File Technical Documentation -> Appendix A. Supplemental Documentation -> Subject Definitions -> Housing Variables -> Year Structure Built -> Median Year Structure Built
Median Year Structure Built
Median year structure built divides the distribution into two equal parts: one-half of the cases falling below the median year structure built and one-half above the median. Median year structure built is computed on the basis of a standard distribution (See the "Standard Distributions" section under "Appendix A.") The median is rounded to the nearest calendar year. Median age of housing can be obtained by subtracting median year structure built from survey year. For example, if the median year structure built is 1969, the median age of housing in that area is 40 years (2011 minus 1970). (For more information on medians, see "Derived Measures.")