Universe: Workers 16 years and Over - B99082001 - Imputation of Private Vehicle Occupancy - American Community Survey 2012 (ACS12) - Survey ACS 2012 (1-Year Estimates)

Data Dictionary:

ACS 2012 (1-Year Estimates)

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Survey: ACS 2012 (1-Year Estimates)

Data Source:

U.S. Census Bureau

Data set: American Community Survey 2012 (ACS12)

Table:

B99082. Imputation of Private Vehicle Occupancy [5]

Universe: Universe: Workers 16 years and Over

Variable Details

B99082.	Imputation of Private Vehicle Occupancy
	Universe: Universe: Workers 16 years and Over
	B99082001Universe: Workers 16 years and Over Percent base: None - percentages not computed (variable is table universe) Aggregation method: Addition

Relevant Documentation:

Excerpt from:	Social Explorer; U.S. Census Bureau; American Community Survey 2012 Summary File: Technical Documentation.
	ACS 2012-1yr Summary File: Technical Documentation -> Appendix A: Supplemental Documentation -> 2012 Subject Definitions -> Quality Measures -> Imputation Rates

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.

Excerpt from:	Social Explorer; U.S. Census Bureau; American Community Survey 2012 Summary File: Technical Documentation.
	ACS 2012-1yr Summary File: Technical Documentation -> Appendix A: Supplemental Documentation -> 2012 Subject Definitions -> Population Variables -> Journey to Work -> Private Vehicle Occupancy

Private Vehicle Occupancy

The data on private vehicle occupancy were derived from answers to Question 32 in 2012 American Community Survey. This question was asked of people who indicated in 2012 ACS Question 29 that they worked at some time during the reference week and who reported in 2012 ACS Question 31 that their means of transportation to work was "Car, truck, or van." Data were tabulated for workers 16 years old and over, that is, members of the Armed Forces and civilians who were at work during the reference week. (See "Reference Week.")

Private vehicle occupancy refers to the number of people who usually rode to work in the vehicle during the reference week. The category, "Drove alone," includes people who usually drove alone to work as well as people who were driven to work by someone who then drove back home or to a non-work destination. The category, "Carpooled," includes workers who reported that two or more people usually rode to work in the vehicle during the reference week.