Civilian noninstitutionalized population - B99183001 - Imputation of Vision Difficulty for the Civilian Noninstitutionalized Population - American Community Survey 2009 (ACS09) - Survey ACS 2009 (1-Year Estimates)

Data Dictionary:

ACS 2009 (1-Year Estimates)

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Survey: ACS 2009 (1-Year Estimates)

Data Source:

U.S. Census Bureau

Data set: American Community Survey 2009 (ACS09)

Table:

B99183. Imputation of Vision Difficulty for the Civilian Noninstitutionalized Population [3]

Universe: Civilian noninstitutionalized population

Variable Details

B99183.	Imputation of Vision Difficulty for the Civilian Noninstitutionalized Population
	Universe: Civilian noninstitutionalized population
	B99183001Civilian noninstitutionalized population 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 2009 Summary File: Technical Documentation.
	ACS 2009-1yr Summary File: Technical Documentation -> Appendix A. Supplemental Documentation -> 2009 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 2009 Summary File: Technical Documentation.
	ACS 2009-1yr Summary File: Technical Documentation -> Appendix A. Supplemental Documentation -> 2009 Subject Definitions -> Population Variables -> Disability Status -> Vision difficulty

Vision difficulty

Vision difficulty was derived from question 17b, which asked respondents if they were "blind or ... (had) serious difficulty seeing" even when wearing glasses. Prior to the 2008 ACS, hearing and vision difficulty were asked in a single question under the label "Sensory disability."