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Intergovernmental Organization Data, 1816-1964 (ICPSR 5520)

Principal Investigator(s): Wallace, Michael, University of Michigan; Singer, J. David, University of Michigan


This data collection describes the membership status of 148 nations in 237 inter-governmental organizations (IGO) that were in place between 1815 and 1964. Each nation is coded at five-year intervals for membership type in each listed IGO, such as full or associate membership, as well as for membership or non-membership in the international system.

Series: Correlates of War Project Series

Access Notes

  • Data in this collection are available only to users at ICPSR member institutions. Please log in so we can determine if you are with a member institution and have access to these data files.


Dataset - Download All Files (3.954 MB)
SAS    SPSS    Stata    R    ASCII    Excel/TSV
ASCII + SAS Setup    SPSS Setup    Stata Setup   

Study Description


Wallace, Michael, and J. David Singer. Intergovernmental Organization Data, 1816-1964. ICPSR05520-v2. ICPSR05520-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2015-01-19. https://doi.org/10.3886/ICPSR05520.v2

Persistent URL: https://doi.org/10.3886/ICPSR05520.v2

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Scope of Study

Subject Terms:    intergovernmental organizations, international affairs, international agreements, international cooperation, international organizations, memberships, organizations

Smallest Geographic Unit:    country

Geographic Coverage:    Global

Time Period:   

  • 1816--1964

Unit of Observation:    nation, intergovernmental organization

Universe:    A total of 148 nations in 237 inter-governmental organizations that were active in the period 1815-1964.

Data Type(s):    administrative records data


Time Method:    Longitudinal: Panel

Mode of Data Collection:    record abstracts

Extent of Processing:   ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:

  • Created variable labels and/or value labels.
  • Checked for undocumented or out-of-range codes.


Original ICPSR Release:   1984-05-03

Version History:

  • 2015-01-19 SPSS, SAS, and Stata setup files, as well as SPSS and Stata system files, a SAS transport (CPORT) file, a tab-delimited data file, and an R data file have been added to the collection. The codebook was updated.

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