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IPUMS-International Integration_ Dissemination_ Usage


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Free census samples (microdata) for researchers and
   policy makers: www.ipums.org/international
   Robert McCaa, Minnesota Population Center

   see also: www.hist.umn.edu/~rmccaa/IPUMSI/
           “Tutorials”, “Usage statistics”,
          “World Bank presentation”, etc.

     “Only used statistics are useful statistics.”
    …invitation to the 58th Session
     ISI: Dublin, Aug 21-26, 2011

»     IPUMS-International Workshop,
      Aug 20-21
     » New IPUMS initiatives
     » Reports by IPUMS users
     » Reports by National Statistical
     » Free and open…
»     International Statistical Institute,
      Aug 21-26
           IPUMS-International: a global collaboratory
            dark green = microdata available to users
(Jun ‘11: 62 countries, 185 censuses, 390 million unit records)
      green = preparation (~60 countries, 159 censuses)
        light green = participation under consideration

                            Integrated into IPUMS   None inventoried
                            Entrusted to IPUMS      None entrusted
                            Mollweide projection
                        * Overview *
          Integrating census samples and metadata
       for research and policy: IPUMS-International

1. What are census microdata (samples)?
2. What do researchers use them for?
3.   Who uses IPUMS-International samples?
4.   How do researchers access the microdata?
     7 tutorials: www.hist.umn.edu/~rmccaa/IPUMSI/ipumsi_explorer.ppt
5.   How did IPUMS overcome the legal, administrative, technical
     obstacles to disseminate census microdata of 90+ countries?
6.   Invitation to use microdata and cooperate with IPUMS-I.
            1. What are census microdata?
           Individual responses to a census.
Each line on this form is one person’s microdata record.
IPUMS-International: Samples (see card handout)
1. Universal population coverage
2. High precision, confidentialized samples—most drawn to
   IPUMS-International specifications
3. Samples—microdata and metadata—are integrated:
   identical concepts have the same codes in all samples
4. Facilitate expert analysis of:
    Fertility and mortality levels: own-child methods, births
      and deaths in the household in the past 12 months.
    Disability and access to health care.
    Household sanitation variables (water supply, toilet, and
      sewage facilities) , Millennium Development Goals
    Employment, Education, etc.
Census samples for research and policy making
 Currently available: 325 million integrated person records
  in 159 samples, representing 55 countries
 Annually, samples for 6-8 countries are integrated into the
  IPUMS-International database.
 Samples for 2010 round censuses are integrated as they
  become available
 Hundred of variables are integrated:
   Demography
   Education
   Employment
   Disability
   Dwelling
2. What are census samples used for?
  see http://bibliography.ipums.org
           Or: www.scholar.google.com
IPUMS-International + key-word: subject, country, etc.
         Research Topics—amazingly diverse

» Economists:
   » Comparative study of labor force participation
   » Demand and supply of public services (water, electricity, sewage, etc.)
   » Economic impact of family planning and fertility decline
   » Brain drain, brain gain
   » Discrimination in credit markets
   » Econometric analysis of labor force and income
   » Effect of long-term youth unemployment
   » Effects of volume of human capital on returns to education
   » Human capital and aging
   » Impact of trade policies on growth, development, immigration, labor
     markets, and inequality
   » Etc.
      3. Who uses IPUMS-International samples?
 See sample card for researcher’s country of residence
www.hist.umn.edu/~rmccaa/IPUMSI click “usage stats”
 IPUMS-International: Unit record data for social
    science and health research and teaching
 Complement one own’s surveys with population data from
 Complement Demographic and Health Surveys or malaria-
  treatment data
 The purpose of IPUMS is to facilitate ready access to unit
  record data for analysis—NOT TO REPLACE OTHER
   “IPUMS-I is an excellent resource for teaching…”
    -- David Lam, president-elect Pop. Assoc. Amer.
1. Free, easy access to data for many countries and censuses
2. Large sample sizes:
• Make it possible to include many different variables in a
   regression… multi-level model…
• Produce separate estimates for population sub-groups
• Easy to extract samples with a target sample size (e.g., 50mb)
• Easy to revise an extract for a larger size or to include more
   countries, censuses, variables or sub-populations
2. Students show a great deal of creativity in using IPUMS-I
3. Skills acquired have an immediate pay-off when applying for
   jobs (e.g., World Bank), graduate school, etc.
                           IPUMS web-sites
                          are “event-driven”.
                              Surf the site
                         (explore in any order)

User registration, conditions of use license

View variables (integrated metadata)

Get data: create a custom-tailored extract: select
countries, years, sub-populations, & variables

View sample descriptions (integrated metadata)
Link to Official Statistical Agency home pages
Bibliography: add yours; view others
7 tutorials on using the IPUMS-International web-site
to obtain census documentation and person records
   First, click here to explore the IPUMS-International
      website--or www.ipums.org and click international.
   Then click a highlighted word for instructions on any
      of the 7 tutorials below:
    Register: to access microdata
    Explore metadata: samples, variables, and sources
    Get data: create custom-tailored extracts
    Download data and codebooks
    Study Indian emigrants using IPUMS
Use the extract system to “Select Cases”.
          Example: Disability
          First, explore the metadata:
variable definition, comparability discussion, etc.
 Continue to explore the metadata:
comparability for specific countries
 Continue to explore the metadata:
comparability for specific countries
      Continue to explore the metadata:
codes and case counts for every sample selected
Second: Click the box to include the variable
      Third: Click “select cases” box
Fourth: Scroll down, select “disabled”, then
         “Continue to next step”

                            Click here, to select
                            every person in
                            households containing
                            an individual with
                            employment disability
            6. Invitation to explore, use and cooperate
»       Explore the metadata, microdata and extract system:
    »      www.ipums.org
    »      www.hist.umn.edu/~rmccaa/IPUMSI/ipumsi_explore.ppt
»       In 1999, our dream: integrate samples of 21 countries in 10
    »      Thanks to generous cooperation of 55 National Statistical Offices
    »      Undreamed technological innovations
»       By 2010, integrated samples for 55 countries
    »      159 samples, 325 million person records
    »      Number of users and usage far exceeded expectations
»       For the 2010 decade, our dream:
    »      Double (2x) the number of integrated samples to 300
    »      Triple (3x) the number of users to 12,000
    »      Quadruple (4x) research output
     The IPUMS-International team
Minneapolis Population Center (May 2009)

                      Steven Ruggles, inventor of IPUMS,
                      Professor of History, and Director
                      of the Minnesota Population Center
  IPUMS-International partners workshop
                           Felicien Accrombessy, Benin
56th ISI, Lisbon (Aug 2007 xxxxxxxxxxxxx7)
                           (currently applying for a WB
                                  position as poverty economist,
        Thank you



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