state_year_format3: Country membership in IGOs by year

In igoR: Access the Intergovernmental Organizations Database

Country membership in IGOs by year

Description

Data on IGOs from 1815 to 2014 at the country-year level. Contains one record per country-year, with years listed at five-year intervals through 1965 and annually thereafter.

Format

data.frame with 15,557 rows. Relevant fields:

• ccode: COW country number, see states2016.

• year: Calendar year.

• state: Abbreviated state name, identical to variable names in igo_year_format3.

• aaaid...wassen: IGO variables containing information on state membership status. See Details.

See Codebook Version 3 IGO Data.

Details

Possible values for the status of a state in the IGO are:

Category	Numerical Value
No Membership	0
Full Membership	1
Associate Membership	2
Observer	3
Missing data	-9
IGO Not In Existence	-1

See the igo_recode_stateyear() section for an easy way to recode the numerical values into factors.

Note

Raw data used internally by igoR.

Source

Intergovernmental Organizations (v3), The Correlates of War Project (IGO Data Stata Files).

References

Pevehouse, J. C., Nordstrom, T., McManus, R. W., & Jamison, A. S. (2020). Tracking organizations in the world: The Correlates of War IGO Version 3.0 data sets. Journal of Peace Research, 57(3), 492–503. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1177/0022343319881175")}.

See Also

countrycode::countrycode() to convert between different country code schemes.

Other datasets: igo_recode_igoyear(), igo_year_format3, states2016

Examples

data("state_year_format3")
dplyr::tibble(state_year_format3)

igoR documentation built on May 23, 2026, 5:08 p.m.