International Governmental Organization (IGO) Data (v2.1)

The IGO data sets contain information about intergovernmental organizations (that is, international organizations that have at least 3 nation-states as their members) from 1815-2000. The IGO data are collected at 5-year intervals from 1815-1965, and annually thereafter. The data are presented in three forms with distinct units of analysis. Form 1 is organized by IGO, listing all IGOs with the IGO-year as the unit of analysis, and identifying all state members of the IGO in that year. Form 2 is organized by state, listing all states with the country-year as the unit of analysis, and identifying all IGO memberships of the state in that year. Form 3 combines individual country memberships into joint dyadic memberships in each IGO, marking joint membership in each IGO for each pair of states. The expanded version 2 updates the original Wallace and Singer (1970) data set to provide membership information from 1964-2000, along with recoding some earlier IGOs. Version 1.0 of the IGO data may be obtained from the Inter-university Consortium for Political and Social Research (ICPSR) as study number 5520 (Intergovernmental Organization Data, 1816-1964 ). Citation information: In any papers or publications that utilize this data set, users a re asked to give the version number and cite the documentation for the data set, as follows (this citation will be replaced by the article of record for the data set when information is available): Bibliography Entry: Jon Pevehouse, Timothy Nordstrom, and Kevin Warnke, "Intergovernmental Organizations, 1815-2000: A New Correlates of War Data Set."

本IGO数据集收录了1815年至2000年间的政府间组织（Intergovernmental Organizations, IGO）相关信息，此类组织指至少包含3个主权国家作为成员国的国际组织。
该数据集的采集频率为：1815年至1965年采用每5年一次的周期，1965年之后转为年度采集。
数据集以三种不同分析单元的形式呈现：
形式1以IGO-年份为分析单元，按政府间组织分类编排，列出全部IGO，并标注对应年份下该组织的所有成员国；
形式2以国家-年份为分析单元，按主权国家分类编排，列出全部国家，并标注对应年份下该国参与的所有IGO成员身份；
形式3将单个国家的成员资格整合为各IGO框架下的双边联合成员关系，标记每一对国家在每个IGO中的联合成员状态。
扩展版本2更新了原版Wallace与Singer（1970）数据集，补充了1964年至2000年的成员国信息，并对部分早期IGO进行了重新编码。
IGO数据集1.0版本可从政治与社会研究大学间联合会（Inter-university Consortium for Political and Social Research, ICPSR）获取，对应研究编号为5520，数据集名称为《1816-1964年政府间组织数据集》。
引用要求：凡使用本数据集的论文或出版物，需标注数据集版本号并引用数据集文档，格式如下（当正式出版信息可获取时，本引用将替换为数据集的正式著录条目）：
参考文献著录：乔恩·佩夫豪斯（Jon Pevehouse）、蒂莫西·诺德斯特龙（Timothy Nordstrom）、凯文·沃恩克（Kevin Warnke）：《1815-2000年政府间组织：一套全新的战争相关因素数据集》（Intergovernmental Organizations, 1815-2000: A New Correlates of War Data Set）