Data Dictionary: ACS 2010 -- 2012 (3-Year Estimates)
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Data Source: U.S. Census Bureau
Table: B99152. Imputation Of Field Of Degree For Population 25 Years And Over [3]
Universe: Universe: POPULATION 25 YEARS AND OVER WITH A BACHELOR'S DEGREE OR HIGHER ATTAINMENT
Table Details
B99152. Imputation Of Field Of Degree For Population 25 Years And Over
Universe: Universe: POPULATION 25 YEARS AND OVER WITH A BACHELOR'S DEGREE OR HIGHER ATTAINMENT
Variable Label
B99152001
B99152002
B99152003
Relevant Documentation:
Excerpt from: Social Explorer; U.S. Census Bureau; American Community Survey 2012 3yr Summary File: Technical Documentation.
 
Imputation Rates
Missing data for a particular question or item is called item nonresponse. It occurs when a respondent fails to provide an answer to a required item. The ACS also considers invalid answers as item nonresponse. The Census Bureau uses imputation methods that either use rules to determine acceptable answers or use answers from similar housing units or people who provided the item information. One type of imputation, allocation, involves using statistical procedures, such as within-household or nearest neighbor matrices populated by donors, to impute for missing values.

Overall Person Characteristic Imputation Rate - This rate is calculated by adding together the weighted number of allocated items across a set of person characteristics, and dividing by the total weighted number of responses across the same set of characteristics.

Overall Housing Characteristic Imputation Rate - This rate is calculated by adding together the weighted number of allocated items across a set of household and housing unit characteristics, and dividing by the total weighted number of responses across the same set of characteristics.

These rates give an overall picture of the rate of item nonresponse for a geographic area.