Data Dictionary: ACS 2007 -- 2009 (3-Year Estimates)
you are here: choose a survey survey data set table variable details
Data Source: U.S. Census Bureau
Universe: Housing units
Variable Details
B25035. Median Year Structure Built
Universe: Housing units
B25035001Median year structure built
Percent base:
None - percentages not computed
Aggregation method:
Median, using bracket table: B25034, interpolation method: Linear
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2007-2009 Summary File: Technical Documentation.
 
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 (2009 minus 1969). (For more information on medians, see "Derived Measures".)