Mollweide projection

1. IPUMS-International: August 2007http://international.ipums.org* * *Robert McCaa, Professor of Population HistoryUniversity of Minnesotarmccaa@umn.eduadditional information at:www.hist.umn.edu/~rmccaa/ipums-global

2. “I have recently taken on a new job at [an international organization] and will be supporting the developing countries in carrying out their censuses. I am therefore interested to understand more about what data have been collected in the past across countries.”--application #1759, ipums.org/international

3. 3. Partners: IPUMS-International, August 2007dark green = disseminating (26 countries, 80 censuses, 200mpr)green = harmonizing (34 countries, 95 censuses, 190mpr)lightest green = negotiating Mollweide projection

4. Overview of project: Goals • IPUMS is a global partnership to (1) preserve census microdata and documentation,(2) integrate census microdata samples, and(3) disseminate anonymized sample extracts to researchers and policy makers, at no cost—regardless of country of birth, residence or citizenship

5. IPUMS: Internationally integrated, anonymized sample extracts: https://www.ipums.org/international • Note: original source files are never accessible to researchers • Extracts of census microdata samples are accessible free-of-charge to qualified users on a restricted access basis • Data are governed by a uniform Memorandum of Understanding endorsed by the National Statistical Office before work begins (70 countries have joined) • Project pays $1/5,000 per census for data, docs, and license • 2-3 years of work (done by MPC) to integrate data • Full source documentation; metadata for statistical packages • >2,000 users: over 50 countries, more than 300 institutions • Sustained funding: National Science Foundation and National Institutes of Health of the USA

6. - 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; they are not official statistics.

7. Summary of Project Milestones • Endorsed Memorandum of Understanding: 72 National Statistical Offices (NSOs) • Entrusted Census Microdata and Documentation: 65 NSOs, 184 censuses • Now accessible: samples for 26 countries, 80 censuses, 200 million person records (at no cost from: ipums.org/international)

8. http://International.ipums.org

9. 2a. Study documentation2b. Submit 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 6 stepsusingipums.org/international:

10. Data Access

11. Composite coding scheme: Employment Status

12. IPUMS Dynamic Metadata System:5 “clicks” to compare any census question, in English, for any combination of years and countries in the database3 “clicks” to view images of original source documentation—census forms and instructions—in the official language (or English translation)

13. Click 1, access: ipums.org/international

14. Click 2: “variables”

15. Click 3: Countries and census years

16. Click 3: Select countries and census years; then, submit sample selections

17. Click 4: chose a variable (e.g., educational attainment)

18. Click 5: “enumeration text”

19. Click 5: Before clicking “enumeration text”, scroll down to see comparability discussion

20. By clicking “enumeration text”, compare text of enumeration form and instructions for Educational Attainment

21. For variable availability, click variable name (X = variable available for this census)

22. For sample counts, click case count view (careful: these are unweighted counts)

23. For complex variables, click “detailed codes”

24. For sample counts, click “case count view”(careful: these are unweighted counts)

25. For images of original source documents, 2 clicks from IPUMS home page:click 1: “Census Questionnaires”

26. For images of original source documents, 2 clicks from IPUMS home page:click 1: “Census Questionnaires”click 2: country, census year, document

27. Thank youipums.org/internationaladditional information at:www.hist.umn.edu/~rmccaa/ipums-global* * * * * *Contact: rmccaa@umn.edu