|Data Dictionary:||ACS 2006 -- 2008 (3-Year Estimates)|
|Data Source:||U.S. Census Bureau|
Universe: Universe: Occupied housing units
|ACS 2008-3yr Summary File: Technical Documentation -> Appendix B: Subject Definitions -> Quality Measures -> 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.
|ACS 2008-3yr Summary File: Technical Documentation -> Appendix B: Subject Definitions -> Housing Variables -> House Heating Fuel|
The data on house heating fuel were obtained from Housing Question 10 in the 2008 American Community Survey. The question was asked at occupied housing units. The data show the type of fuel used most to heat the house, apartment, or mobile home.
This category includes gas piped through underground pipes from a central system to serve the neighborhood.
Bottled, Tank, or LP Gas
This category includes liquid propane gas stored in bottles or tanks that are refilled or exchanged when empty.
Electricity is generally supplied by means of above or underground electric power lines.
Fuel Oil, Kerosene, etc.
This category includes fuel oil, kerosene, gasoline, alcohol, and other combustible liquids.
Coal or Coke
This category includes coal or coke that is usually distributed by truck.
This category includes purchased wood, wood cut by household members on their property or elsewhere, driftwood, sawmill or construction scraps, or the like.
This category includes heat provided by sunlight that is collected, stored, and actively distributed to most of the rooms.
This category includes all other fuels not specified elsewhere.
No Fuel Used
This category includes units that do not use any fuel or that do not have heating equipment.
Since 1996, the American Community Survey questions have remained the same.