U.S. Virgin Islands Public Use Microdata Sample (PUMS): Technical Documentation U.S
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U.S. Virgin Islands Public Use Microdata Sample (PUMS) Issued September 2013 2010 Census of Population and Housing PUMSVI/10-1 Technical Documentation U.S. Department of Commerce Economics and Statistics Administration U.S. CENSUS BUREAU For additional information concerning the files, contact the Customer Liaison and Marketing Services Office, Customer Services Center, U.S. Census Bureau, Washington, DC 20233, or phone 301-763-INFO (4636). For additional information concerning the technical documentation, contact the Administrative and Customer Services Division, Electronic Products Development Branch, U.S. Census Bureau, Washington, DC 20233, or phone 301-763-8004. U.S. Virgin Islands Public Use Microdata Sample (PUMS) Issued September 2013 2010 Census of Population and Housing PUMSVI/10-1 Technical Documentation U.S. Department of Commerce Penny Pritzker, Secretary Patrick D. Gallagher, Acting Deputy Secretary Economics and Statistics Administration Mark Doms, Under Secretary for Economic Affairs U.S. CENSUS BUREAU John H. Thompson, Director SUGGESTED CITATION 2010 Census of Population and Housing, U.S. Virgin Islands Public Use Microdata Sample (PUMS): Technical Documentation U.S. Census Bureau, 2013 Economics and Statistics Administration Mark Doms, Under Secretary for Economic Affairs U.S. CENSUS BUREAU John H. Thompson, Director Nancy A. Potok, Deputy Director and Chief Operating Officer Frank A. Vitrano, Acting Associate Director for Decennial Census Enrique J. Lamas, Associate Director for Demographic Programs William W. Hatcher, Jr., Associate Director for Field Operations CONTENTS CHAPTERS 1. Abstract ............................................... 1-1 2. Introduction ............................................ 2-1 3. How to Use This Product ................................... 3-1 4. Sample Design and Estimation ............................... 4-1 5. Accuracy of the Microdata Sample Estimates .................... 5-1 6. Data Dictionary .......................................... 6-1 7. User Updates ............................................ 7-1 APPENDIXES A. Geographic Terms and Concepts ............................. A-1 B. Definitions of Subject Characteristics .......................... B-1 C. Data Collection and Processing Procedures ..................... C-1 D. Questionnaire ........................................... D-1 E. Maps .................................................. E-1 F. Code Lists .............................................. F-1 G. Residence Rule and Residence Situations for the 2010 Census of the Island Areas ....................................... G-1 H. Topcoded Variables and Control Counts ........................ H-1 v Chapter 1. Abstract CONTENTS Citation ..................................................................... 1-1 Type of File ................................................................... 1-1 Subject Content ............................................................... 1-1 Geographic Content ............................................................ 1-2 User Updates ................................................................. 1-2 CITATION U.S. Census Bureau, 2010 Census of Population and Housing, U.S. Virgin Islands Public Use Microdata Sample: Technical Documentation, 2013. TYPE OF FILE Microdata. SUBJECT CONTENT The Public Use Microdata Sample (PUMS) file contains records representing a 10-percent sample of the occupied and vacant housing units in the U.S. Virgin Islands and the people in the occupied units. People living in group quarters also are included in the sample. The file contains a weight of 10 for each person and housing unit, which when applied to the individual records, expands the sample to the relevant total. See Chapter 6, Data Dictionary, for a complete list of the variables in this file. Population subjects include: Age Marital status Children ever born (fertility) Nativity Citizenship status Occupation Class of worker Parents’ place of birth Disability status Place of birth Earnings in 2009 Place of work Educational attainment Poverty status in 2009 Employment status Race Family type Residence in 2009 (migration) Foreign-born status School enrollment Grandparents as caregivers Service-connected disability status and ratings Group quarters population Sex Health insurance coverage status Travel time to work Hispanic or Latino origin Veteran status Household type and relationship Vocational training Income in 2009 Work experience Industry Year of entry Journey to work (commuting) Language spoken at home and ability to speak English Abstract 1-1 U.S. Census Bureau, 2010 Census U.S. Virgin Islands Public Use Microdata Sample Housing subjects include: Acreage Occupants per room Agricultural sales Plumbing facilities Business on property Purchase of water from water vendor Computer ownership Selected monthly owner costs Condominium status and fee Sewage disposal Cooking fuel Source of water Gross rent Telephone service available Internet service Tenure Kitchen facilities Units in structure Mobile home costs Vacancy status Mortgage status Value of home Number of bedrooms Vehicles available Number of rooms Year householder moved into unit Occupancy status Year structure built GEOGRAPHIC CONTENT The 2010 PUMS file for the U.S. Virgin Islands provides records for the U.S. Virgin Islands as a whole. There are no smaller geographies available on this file. USER UPDATES User updates inform data users about unique characteristics, corrections, errata, and related explanatory information. However, sometimes this information becomes available too late to be reflected in the product or related documentation. User updates are available in Chapter 7. 1-2 Abstract U.S. Census Bureau, 2010 Census U.S. Virgin Islands Public Use Microdata Sample Chapter 2. Introduction CONTENTS Overview .................................................................... 2-1 What are Microdata? ............................................................ 2-1 Protecting Confidential Information ................................................ 2-1 Use of Microdata Files ........................................................... 2-2 Sample Design and Size ......................................................... 2-2 Subject Content ............................................................... 2-3 Geographic Content ............................................................ 2-3 Corresponding Microdata From Earlier Censuses ....................................... 2-3 OVERVIEW Public Use Microdata Sample (PUMS) files are ASCII files that contain individual records of the characteristics for a sample of people and housing units. Information that could identify a household or an individual is excluded from the PUMS files in order to protect the confidentiality of respondents. Within the limits of the sample size, the geographic detail, and the confidentiality protection, these files allow users to prepare virtually any tabulation they require. WHAT ARE MICRODATA? Microdata are the individual records that contain information collected about each person and housing unit. They include the computerized versions of the questionnaires collected from households, as coded and edited during census processing. The Census Bureau uses these confidential microdata to produce the summary data that go into published data products. PUMS are extracts from the confidential microdata taken in a manner that avoids disclosure of information about households or individuals. For the 2010 Census, the microdata are only available to the public through the PUMS products. PROTECTING CONFIDENTIAL INFORMATION All data released (in print or electronic media) by the Census Bureau are subject to strict confidentiality measures imposed by the legislation under which the data are collected: Title 13 of the United States Code. Title 13 authorizes the Census Bureau to conduct surveys and censuses, and mandates that any information obtained from private individuals and establishments remains confidential. Section 9 of Title 13 prohibits the Census Bureau from releasing “any publication whereby the data furnished by any particular establishment or individual under this title can be identified.” The Census Bureau has modified or suppressed some data in this data release to protect confidentiality using disclosure avoidance. A disclosure of data occurs when someone can use published statistical information to identify an individual who provided information under a pledge of confidentiality. Using disclosure avoidance, the Census Bureau modifies or removes all of the characteristics that put confidential information at risk for disclosure. Although it may appear that a table shows information about a specific individual, the Census Bureau has taken steps to disguise the original data while making sure the results are useful. The Census Bureau’s internal Disclosure Review Board monitors the disclosure review process and sets the confidentiality rules for all data releases. The main disclosure avoidance method used is to limit the geographic detail shown in the files. A geographic area must have a minimum population of 100,000 to be fully identified. Thus, the only geography indicated on the PUMS is the U.S. Virgin Islands in its entirety. Confidentiality is protected, in part, by the use of the following processes: data swapping, synthetic data, topcoding and/or Introduction 2-1 U.S. Census Bureau, 2010 Census U.S. Virgin Islands Public Use Microdata Sample bottomcoding of selected variables, age perturbation for