THE ALLIANCE TREATY OBLIGATIONS AND PROVISIONS PROJECT (ATOP)
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ATOP Data, v5.1
Last updated: Aug. 2022
Data in STATA format:
ATOP v5.1 Data (.dta)
File Size: 2789 kb
File Type: zip
Download File

Data in CSV format:
ATOP v5.1 Data (.csv)
File Size: 2560 kb
File Type: zip
Download File

We ask users of the ATOP data to employ the following citation:

Leeds, Brett Ashley, Jeffrey M. Ritter, Sara McLaughlin Mitchell, and Andrew G. Long. 2002. Alliance Treaty Obligations and Provisions, 1815-1944. International Interactions 28: 237-260.
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ATOP data are available in six basic formats with six different units of analysis: the alliance, the alliance phase, the alliance member, the state-year, the dyad-year, and the directed dyad-year. All six formats and the variables included in each file are explained in detail in the ATOP codebook. In addition, we provide data for the same six units of analysis excluding nonaggression pacts (see page 14 of the ATOP codebook).



Brett Ashley Leeds
Rice University


Send comments or questions about this site to:
​[email protected]

Created with assistance from:
Jaewook Chung,
Nicholas Coulombe,
Jessica Edry,
Jesse Johnson,
Andrew G. Long,

Michaela Mattes,
Sara McLaughlin Mitchell,
Jeffrey M. Ritter,
and Burcu Savun,
  • Home
  • Data
  • Documentation
  • Additional Data
  • Dataset History
  • Contact