igo_year_format3: IGO-year membership data

In igoR: Access the Intergovernmental Organizations ('IGO') Database

IGO-year membership data

Description

Data on intergovernmental organizations (IGOs) from 1816 to 2014 at the IGO-year level. Each row represents one IGO in one year. Years are recorded at five-year intervals through 1965 and annually thereafter.

Format

A data.frame with 19,335 rows. Relevant fields:

• ioname: Short abbreviation for the IGO name.

• orgname: Full IGO name.

• year: Calendar year.

• afghanistan...zimbabwe: Membership status of each state in the IGO. See the Details section.

• sdate: Start year for the IGO.

• deaddate: End year for the IGO.

• longorgname: Longer IGO name, including previous names.

• ionum: IGO identifier in versions 2.1 and 3.0 of the data.

• version: Correlates of War version number.

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
State Not System Member	-1

Use igo_recode_igoyear() to recode the numerical values as factors.

Note

Data distributed with igoR.

Source

Intergovernmental Organizations (version 3), IGO Data Stata Files from the Correlates of War Project.

See the Codebook Version 3 IGO Data for the full reference.

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

Other data sets: state_year_format3, states2016

Examples

data("igo_year_format3")

# Show a glimpse.
library(dplyr)

igo_year_format3 %>%
  select(ioname:year, spain, france) %>%
  filter(year > 1990) %>%
  glimpse()

# Prepare a sample of numerical membership values.
sample_igo_year <- igo_year_format3 %>%
  as_tibble() %>%
  select(ioname:year, spain, france) %>%
  filter(year == 1990)

sample_igo_year %>% glimpse()

# Recode the membership columns.
sample_igo_year_recoded <- sample_igo_year %>%
  mutate(across(c(spain, france), igo_recode_igoyear))

sample_igo_year_recoded %>% glimpse()

igoR documentation built on June 24, 2026, 9:07 a.m.