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The IPUMS team (lack computer gurus, some researchers, & 3 PIs were away or too busy to pose!)

IPUMS workshop https://international.ipums.org * * * Robert McCaa, Professor of Population History University of Minnesota rmccaa@umn.edu additional information at: www.hist.umn.edu/~rmccaa/ipums-europe.

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The IPUMS team (lack computer gurus, some researchers, & 3 PIs were away or too busy to pose!)

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  1. IPUMS workshophttps://international.ipums.org* * *Robert McCaa, Professor of Population HistoryUniversity of Minnesotarmccaa@umn.eduadditional information at:www.hist.umn.edu/~rmccaa/ipums-europe

  2. The IPUMS team (lack computer gurus, some researchers, & 3 PIs were away or too busy to pose!) Steven Ruggles, Inventor of IPUMS, Professor of History and Director, Minnesota Population Center

  3. IPUMS-Greece Timeline • May, 2003: Memorandum of Understanding signed • July, 2005: Microdata samples entrusted for censuses of 1971, 1981, 1991 and 2001 • April, 2006: Translations of documentation completed • Dec., 2006: Integration completed; dissemination begins

  4. Outline (65 slides, yikes!!) • 1. IPUMS goals and milestones 11 slides • 2. Applying for Access 8 slides • 3. Studying documentation 15 slides • 4. Creating an extract 9 slides • a. Selecting samples • b. Selecting variables • c. Selecting sub-populations • 5. Integrating microdata 9 slides • 6. Managing access: Users and Uses 13 slides

  5. Project goals • IPUMS is a global partnership to (1) preserve census microdata and documentation,(2) integrate census microdata samples, and(3) manage access to anonymized sample extracts for researchers and policy makers, at no cost—regardless of country of birth, residence or citizenship

  6. Preservation: 1973 census tapes of Sudan at risk!

  7. A Solution: Data recovery

  8. Microdataon this tape were recovered!! Data recovery. Example: Bangladesh Bureau of Statistics (1981 census, 276 tapes to recover) >3,000 tapes recovered: 1971 Germany1980 Mexico, Mali 76, Sudan 73and many more

  9. Integration, Dissemination: March 2008dark green = disseminating (26 countries, 80 censuses, 200mpr)green = harmonizing (34 countries, 95 censuses, 190mpr)lightest green = negotiating (see handout) Mollweide projection

  10. Milestones • 1999: Founded by Steven Ruggles and Bob McCaa, –restrict access to trusted users, and apply corresponding confidentiality techniques • 2002: 1st release of integrated samples for 7 countries; >200 users in first year • 2008: Big hit! 79 countries signed; 70 entrusted data to IPUMS, datasets for more than 230 censuses, >150 entire datasets

  11. Milestones • 2007, 4th release: • data for 26 countries, samples for 80 censuses, • 202 million person records, • ~2,000 users • 2009, 6th release: • data for 40 countries, samples for ~130 censuses • >300 million person records • thousands of users • Note: data extracts are provided only to licensed users.

  12. 2a. Study documentation2b. Design extract 3. Receive email; logon with p/word 1. Logon w/ password (also SAS, STATA) 4. Download extract (SSL encrypted) 5. UnZip data 6. Analyze 2. Usinghttps://www.ipums.org/international:

  13. - Warning - • IPUMS microdata are anonymized samples. • They are for advanced analysis and research. • Use of a statistical software is required. • Statistical software provides great power. • “With great power, comes great responsibility.” • IPUMS samples are for analysis. • IPUMS samples are not official statistics.

  14. http://international.ipums.org Apply for access (see form and conditions of use) Construct a custom-tailored request: select countries, years, sub-populations, & variables Examine integrated metadata (samples) Study integrated documentation (variables) Link to Official Statistical Agency home pages

  15. Dr. Bob’s 7 rules for using IPUMSi microdata • Respect “restricted-access” conditions of use: protect confidentiality; “share” data with only with registered users • Study both source documentation and metadata: • source: census forms and instructions to enumerators • metadata: samples, variables, comparability discussions • Construct extracts judiciously:use “subsamp” (1% sample for testing) extract only needed countries, censuses, variables, sub-pops • Use weights:either households or individuals (geographical strata = power) • Analyze carefully:proper statistical techniques, keeping in mind data quality • Cite properly: IPUMSi and National Statistical Agencies • Share publications: IPUMSiand National Statistical Agencies

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