Documentation - ACS 2008 (1-Year Estimates)

Documentation:

ACS 2008 (1-Year Estimates)

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Publisher: U.S. Census Bureau

Survey: ACS 2008 (1-Year Estimates)

Documentation

ACS 2008 (1-Year Estimates)

American Community Survey Office
U.S. Census Bureau

ACS 2008-1yr Summary File: Technical Documentation

Chapter 1. Abstract

1.1. Citation

1.2. Special Notes

1.3. Notes on Updates to the Technical Document Since 2008

1.3.1. Updated Chapters

1.3.2. Updated Appendices

1.4. Type of File

1.5. Subject Content

1.6. Geographic Content

1.6.1. State Files

1.6.2. National Files

1.7. Document Overview

1.8. User Updates

Chapter 2. How to Use the ACS Summary File

2.1. Introduction

2.2. Data Format

2.3. File Naming Conventions

2.4. Reading the Geographic Header Record

2.5. Geographic Hierarchy Primer

2.6. Worked Example

2.7. Data Structure and Segmentation

Chapter 3. Subject Locator

Chapter 4. Summary Level Sequence Chart

4.7. Table Name Changes - ACS 5yr

4.8. Table Name Changes - ACS 1yr

Chapter 5. List of Detailed Tables

Chapter 6. Accuracy of the Data

6.1. 2008 ACS Accuracy of the Data (US)

6.1.1. Introduction

6.1.2. Data Collection

6.1.3. Sampling Frame

6.2. 2008 ACS Accuracy of the Data (Puerto Rico)

6.2.1. Introduction

6.2.2. Data Collection

6.2.3. Sampling Frame

6.2.4. Sample Design

6.2.5. Weighting Methodology

6.2.6. Confidentiality of the Data

6.2.7. Errors in the Data

6.2.8. Measures of Sampling Error

6.2.9. Calculation of Standard Errors

6.2.10. Examples of Standard Error Calculations

6.2.11. Control of Nonsampling Error

Chapter 7. User Updates

Appendix A. ACS Geographic Terms and Concepts

Introduction-Geographic Presentation of Data

Hierarchical Presentation

Inventory Presentation

American Indian/Alaska Native Area/Hawaiian Home Land (AIANA/HHL) Entities

American Indian Area, Alaska Native Area, Hawaiian Home Land

Alaska Native Regional Corporation (ANRC)

Alaska Native Village Statistical Area (ANVSA)

American Indian Reservation

American Indian Off-Reservation Trust Land

American Indian Tribal Subdivision

Hawaiian Home Land (HHL)

Oklahoma Tribal Statistical Area (OTSA)

State Designated American Indian Statistical Area (SDAISA)

Tribal Designated Statistical Area (TDSA)

Congressional District (CD)

County (or Statistically Equivalent Entity)

County Subdivision

Census County Division (CCD)

Census Subarea

Minor Civil Division (MCD)

Unorganized Territory

Geographic Code

Census Code

Federal Information Processing Standards (FIPS) Code

United States Postal Service (USPS) Code

Internal Point

Island Areas of the United States

Metropolitan Area (MA)

Central City

Consolidated and Primary Metropolitan Statistical Area (CMSA and PMSA)

Metropolitan Statistical Area (MSA)

Metropolitan Area Title and Code

New England County Metropolitan Area (NECMA)

Place

Census Designated Place (CDP)

Consolidated City

Incorporated Place

Population or Housing Unit Density

Public Use Microdata Area (PUMA)

Puerto Rico

Municipio

Barrio, Barrio-Pueblo, and Subbarrio

Zona Urbana and Comunidad

School District

State (or Statistically Equivalent Entity)

State Legislative District (SLD)

TIGER® Database

Traffic Analysis Zone (TAZ)

Urban Growth Area (UGA)

Voting District (VTD)

ZIP Code® Tabulation Area (ZCTA™)

Combined New England City and Town Area (CNECTA)

Combined Statistical Area (CSA)

Core Based Statistical Area (CBSA)

Metropolitan Division

Metropolitan Statistical Area/Micropolitan Statistical Area

New England City and Town Area (NECTA)

New England City and Town Area (NECTA) Division

State Designated Tribal Statistical Area (SDTSA)

Appendix B. Subject Definitions

Condominium Status and Fee

Contract Rent

Food Stamp Benefits

Gross Rent

Gross Rent as a Percentage of Household Income

Homeowner Vacancy Rate

House Heating Fuel

Household Size

Housing Units

Insurance for Fire, Hazard, and Flood

Kitchen Facilities

Meals Included in Rent

Mobile Home Costs

Monthly Housing Costs

Monthly Housing Costs as a Percentage of Household Income

Mortgage Payment

Mortgage Status

Occupants Per Room

Occupied Housing Units

Owner-Occupied Units

Plumbing Facilities

Population in Occupied Housing Units

Poverty Status of Households

Real Estate Taxes

Rent Asked

Rental Vacancy Rate

Renter-Occupied Housing Units

Rooms

Second or Junior Mortgage Payments or Home Equity Loan

Selected Conditions

Selected Monthly Owner Costs

Selected Monthly Owner Costs as a Percentage of Household Income

Specified Owner-Occupied Units

Specified Renter-Occupied Units

Telephone Service Available

Vacant-Current Residence Elsewhere

Vacant Housing Units

Value

Vehicles Available

Year Householder Moved into Unit

Year Structure Built

Population Variables

General Information

Ability to Speak English

Age

Ancestry

Children Ever Born

Citizenship Status (U.S. Citizenship Status)

Class of Worker

Disability Status

Educational Attainment

Employment Status

Families

Fertility

Foreign-Born Population

Foster Children

Grade in Which Enrolled

Grandparents as Caregivers

Group Quarters (GQ)

Health Insurance Coverage

Hispanic or Latino Origin

Household

Household Type and Relationship

Household Size

Householder

Immigrants

Income in the Past 12 Months

Industry, Occupation, and Class of Worker

Journey to Work

Labor Force Status

Language Spoken at Home and Ability to Speak English

Marital Status/Marital History

Means of Transportation to Work

Period of Military Service

Poverty Status in the Past 12 Months

Private Vehicle Occupancy

Race

Reference Week

Relatives and Nonrelatives

Residence 1 Year Ago

School Enrollment and Type of School

Sex

Social Security Income

Subfamily

Time Leaving Home to Go to Work

Travel Time to Work

Type of School

Usual Hours Worked in the Past 12 Months

Veteran Status

Weeks Worked in the Past 12 Months

Work Experience

Work Status in the Past 12 Months

Rounding for selected aggregates

Special rounding rules for aggregates

Aggregates Subject to Rounding:

Appendix C. Data Collection and Processing Procedures

C.1. Self-enumeration through mail-out/mail-back methodology

C.2. Computer Assisted Telephone Interviewing (CATI)

C.3. Computer Assisted Personal Interviewing (CAPI)

Appendix D. Questionnaire

The American Community Survey 2008

2008 ACS Questionnaire - English

2008 ACS Group Quarters Questionnaire (English and Spanish)

The Puerto Rican Community Survey 2008

2008 PRCS Questionnaire- English

2008 PRCS Group Quarters Questionnaire (English and Spanish)

Appendix E. Data Products and User Assistance

Appendix F. Maps

Appendix G. Code Lists

2008 American Community Survey/Puerto Rico Community Survey

Group Quarters

Correctional Facilities for Adults

Juvenile Facilities

Nursing Facilities/Skilled Nursing Facilities

Other Health Care Facilities

College/University Student Housing

Military Group Quarters

Other Noninstitutional Facilities

Appendix H. Examples of Standard Error Calculations

Appendix I. Sample SAS Programs

Appendix J. User Notes

Social Explorer; U.S. Census Bureau; American Community Survey 2008 Summary File: Technical Documentation.

Design and Methodology: American Community Survey

Acknowledgments

Foreword

The American Community Survey-A Revolution in Data Collection

The Beginning

Annual results will be available for all areas by 2010

The 2008 release of the ACS Design and Methodology Report

Success of the Program

Chapter 1. Introduction

Chapter 2. Program History

Overview

Design Origins and Early Proposals

Development

Demonstration

Full Implementation

Stakeholders and Contributors

References

Chapter 3. Frame Development

Overview

Master Address File Content

Master Address File Development and Updating for the Uinted States Housing Unit Iinventory

MAF Development in the United States

MAF Improvement Activities and Operations

Delivery Sequence File

MAFGOR

Address Updates From ACS Nonresponse Follow-Up

DAAL

CAUS

Master Address File Development and Updating for Puerto Rico

MAF Development in Puerto Rico

MAF Improvement Activities and Operations in Puerto Rico

Master Address File Development and Updating for Special Places and Group Quarters in the United States and Puerto Rico

MAF Development for Special Places and GQs

MAF Improvement Activities and Operations for Special Places and GQs

American Community Survey Extracts from the Master Address File

References

Chapter 4. Sample Design and Selection

Overview

Housing Unit Sample Selection

First-Phase Sample

Main and Supplemental Sampling

Determining the Sampling Rates

First-Stage Sample: Random Assignment of Addresses to a Specific Year

Second-Stage Sampling: Selection of Addresses

Sample Month Assignment for Address Samples

Second-phase Sampling for CAPI Follow-up

Group Quarters Sample Selection

Small Group Quarters Stratum Sample

First Phase of Small GQ Sampling-Stage One: Random Assignment of GQ Facilities to Subframes

First Phase of Small GQ Sampling Stage Two: Selection of Facilities

Second Stage of Small GQ Sampling: Selection of Persons Within Selected Facilities

Large Group Quarters Stratum Sample

First Phase of Large GQ Sampling: Selection of Groups of Ten (and Associated Facilities)

Second Phase of Large GQ Sampling: Selection of Persons Within Facilities

Sample Month Assignment for Small and Large Group Quarter Samples

Remote Alaska Sample

References

Chapter 5. Content Development Process

Overview

History of Content Development

2003-2007 Content

ACS Content

Puerto Rico Community Survey (PRCS) Content

Content Policy and Content Change Process

Content Change Factors

Content Change Requirements

2006 Content Test

References

Chapter 6. Survey Rules, Concepts, and Definitions

Structure of the Housing Unit Questionnaire

Address, Housing Unit Status, and Household Information

Basic Demographic Information

Detailed Housing Information

Detailed Population Information

Structure of the Group Quarters Questionnaires

Chapter 7. Data Collection and Capture for Housing Units

Telephone Questionnaire Assistance (TQA)

Data Capture

Failed-Edit Follow-Up

Telephone Phase

Personal Visit Phase

Data Collection in Remote Alaska

References

Chapter 8. Data Collection and Capture for Group Quarters

Overview

Group Quarters (Facility)-Level Phase

Previsit Mailings

GQ Introductory Letter

GQ Frequently Asked Questions (FAQ) Brochure

GQ State and Local Correctional Facilities Letter

Initial Contact With GQ Facility

Visiting the GQ Facility

Person-Level Phase

Preparation

Person-Level Survey Materials

Completing the GQ Questionnaire

Questionnaire Review

Check-In and Data Capture

Check-In

Data Capture

Special Procedures

Biannual Data Collection in Remote Alaska

Annual Data Collection Restrictions in Correctional and Military Facilities

Survey Period and Security Restrictions in Federal Correctional Facilities

Chapter 9. Language Assistance Program

Telephone and Personal Visit Follow-Up

Group Quarters

Research and Evaluation

References

Chapter 10. Data Preparation and Processing for Housing Units and Group Quarters

Overview

Data Preparation

Creation and Preparation of Data Capture Files

Daily Data Processing

Monthly Data Processing

Coding

Backcoding

Industry and Occupation Coding

Geocoding

Preparation for Creating Select Files and Edit Input Files

Response Type and Number of People in the HU

Determining if a Return Is Acceptable

Unduplicating Multiple Returns

Creating the Select Files and Edit Input Files

Select Files

Edit Input Files

Data Processing

Editing and Imputation

Editing

Imputation

Generating Recoded Variables

Reviewing Edit Results

Creating Input Files for Data Products

Multiyear Data Processing

References

Chapter 11. Weighting and Estimation

Overview

2007 ACS Group Quarters Person Weighting

Sampling Weight

Calculation of the GQ NonInterview Adjustment Factor

Calculation of the GQ Person Post-Stratification Factor

2007 ACS Housing Unit Weighting-Overview

2007 ACS Housing Unit Weighting-Probability of Selection

Sampling Weight

Variation in the Monthly Sample Factor

2007 ACS Housing Unit Weighting-Noninteview Adjustment

Calculation of the First Noninterview Adjustment Factor

Calculation of the Second Noninterview Adjustment Factor

Calculation of the Mode Noninterview Factor and Mode Bias Factor

2007 ACS Housing Unit Weighting-Housing Unit and Population Controls

Models for PEP estimates of housing units and population

Calculation of Housing Unit Post-Stratification Factor

Calculation of Person Weights

Calculation of Final Housing Unit Factors

Multiyear Estimation Methodology

Pooling the data

Geography

Derivation of the multiyear controls

Model-assisted estimation

Other multiyear estimation steps

References

Chapter 12. Variance Estimation

Overview

Variance Estimation for ACS Housing Unit and Person Estimates

Replicate Factors

Replicate Weights

Variance Estimates

Variance Estimation for Multiyear ACS Estimates

Margin of Error and Confidence Interval

Variance Estimation for the PUMS

References

Chapter 13. Preparation and Review of Data Products

Overview

Geography

Defining the Data Products

Description of Aggregated Data Products

Geographic Comparison Tables (GCTs)

Thematic Maps

Selected Population Profiles (SPPs)

Public Use Microdata Sample

Generation of Data Products

Disclosure Avoidance

Swapping

Data Release Rules

Data Review and Acceptance

Important Notes on Multiyear Estimates

Custom Data Products

Chapter 14. Data Dissemination

Overview

Schedule

Data Release Timetable

Presentation of Tables

American FactFinder

ACS Web Site

File Transfer Protocol (FTP) Site

Chapter 15. Improving Data Quality by Reducing Nonsampling Error

Address Corrections from Rural Directories

Address Listing

Administrative Entities

Allocation

American Community Survey (ACS) Alert

American Community Survey Demonstration Program

American Community Survey Full Implementation

American Community Survey Test Sites

American FactFinder (AFF)

American Indian Area, Alaska Native Area, Hawaiian Homeland (AIANAHH)

Assignment

Automated Address Unduplication

Automated Clerical Review

Automated Editing

Automated Listing and Mapping Instrument (ALMI)

Automated Review Tool (ART)

Automated Review Tool II (ART II)

Base Tables

Base Weight

Be Counted Enumeration and Be Counted Questionnaire

Boundary and Annexation Survey (BAS)

Case Management

Census 2000 Supplementary Survey (C2SS)

Census County Division (CCD)

Census Designated Place (CDP)

Census Geography

Census Information Center (CIC)

Coefficient of Variation (CV)

Cold Deck Values

Collapsing

Community Address Updating System (CAUS)

Comparison Profile

Complete Interview

Computer-Assisted Personal Interviewing (CAPI)

Computer-Assisted Telephone Interviewing (CATI)

Confidence Interval

Confidentiality

Congressional Tool Kit

Consumer Price Index (CPI)

Control File

Controlled

Count Question Resolution (CQR)

Cross Tabulation

Current Population Survey (CPS)

De Facto Residence Rules

Delivery Sequence File (DSF)

Demographic Area Address Listing (DAAL)

Derived Products

Detailed Tables

Disclosure Avoidance (DA)

Disclosure Review Board (DRB)

Edit

Edit Management and Messaging Application (EMMA)

Estimates

Evaluation Studies

Failed Edit Follow-Up (FEFU)

Federal Agency Information Program (FAIP)

Federal Government Unit (FGU)

Federal Register Notice

Federal-State Cooperative Program for Population Estimates (FSCPE)

Field Representative (FR)

File Transfer Protocol (FTP)

Final Outcome Code

First Stage Sample

Five-Year Estimates

Functioning Governmental Unit (FGU)

General Coding

Geocoding

Geographic Summary Level

Government Printing Office (GPO)

Governmental Unit Measure of Size (GUMOS)

Group Quarters (GQ) Facilities

Group Quarters Facilities Questionnaire (GQFQ)

Group Quarters Geocoding Correction Operation

Group Quarters Listing Sheet

Group Quarters Measure of Size (GQMOS)

Interactive Voice Recognition (IVR)

Intercensal Estimates

Local Update of Census Addresses (LUCA)

Master Address File (MAF)

Master Address File Geocoding Office Resolution (MAFGOR)

Master Address File/TIGER® Reconciliation

Margin of Error (MOE)

Measure of Size (MOS)

Measurement Error

Median

Metadata

Minor Civil Division (MCD)

Multiyear Estimates

Municipio

Narrative Profile

National Processing Center (NPC)

Non-City-Style Address

Noninterview/Nonresponse

Nonresponse Error

Nonresponse Follow-Up

Nonsampling Error

Office of Management and Budget (OMB)

Operational Response Rates

Optical Mark Recognition (OMR)

Overcoverage

Period Estimates

Point-in-Time Estimates

Population Controls

Primary Sampling Unit (PSU)

Processing Error

Public Use Microdata Area (PUMA)

Public Use Microdata Sample (PUMS) Files

Public Use Microdata Sample (PUMS) Management and Messaging Application (PMMA)

Puerto Rico Community Survey (PRCS)

Quality Assurance (QA)

Selected Population Profiles (SPPs)

Short Form

Single-Year Estimates

Size Thresholds

Small Area Income and Poverty Estimates (SAIPE)

Special Census

Special Place (SP)

Special Sworn Status (SSS) or Special Sworn Status (SSS) Individual

Standard Error

State Data Center (SDC)

Statistical Areas

Statistical Significance

Successive Differences Replication (SDR)

Sufficient Partial Interview

Summary File 3 (SF 3)

Summary File 4 (SF 4)

Supplemental Sample

Survey

Survey of Income and Program Participation (SIPP)

Survey Quality

Survey Response Rates

Telephone Questionnaire Assistance (TQA)

Topologically Integrated Geographic Encoding and Referencing (TIGER®) System or Database

Tract

Undeliverable-As-Addressed (UAA)

Voluntary Methods Test

WebCATI

Web Data Server (WDS)

Weighting

Glossary of Basic Geographic and Related Terms - Census 2000

Alaska Native Regional Corporation (ANRC)

Alaska Native village (ANV)

Alaska Native village statistical area (ANVSA)

American Indian off-reservation trust land

American Indian reservation

American Indian tribal subdivision

American Indian trust land

Barrio, barrio-pueblo

Block numbering area (BNA)

Census county division (CCD)

Census designated place (CDP)

Congressional district (CD)

Consolidated city

Consolidated metropolitan statistical area (CMSA)

County

County subdivision

Division (census geographic)

Governmental unit (GU)

Hawaiian home land (HHL)

Metropolitan area (MA)

Metropolitan statistical area (MSA)

Minor civil division (MCD)

Municipality

Municipio

New England County Metropolitan Area (NECMA)

Off-reservation trust land

Oklahoma tribal statistical area (OTSA)

Outlying Areas

Parish

Place

Primary metropolitan statistical area (PMSA)

Pseudo-voting district (pseudo-VTD)

Public use microdata area (PUMA)

Region (census geographic)

Rural

School district

State

State designated American Indian statistical area (SDAISA)

State legislative district (SLD)

Traffic analysis zone (TAZ)

Tribal block group

Tribal census tract

Tribal designated statistical area (TDSA)

Tribal jurisdiction statistical area (TJSA)

Tribal subdivision

Trust land

United States

Unorganized territory (UT)

Urban

Urban area

Urban cluster (UC)

Urban growth area (UGA)

Urbanized area (UA)

Voting district (VTD)

ZIP Code area

ZIP Code tabulation area (ZCTAa)

Zona urbana

Social Explorer; U.S. Census Bureau; Design and Methodology, American Community Survey. U.S. Government Printing Office, Washington, DC, 2009.

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