|COW||Militarized Interstate Disputes (v3.10)|
Version 3.0 of the Militarized Interstate Dispute (MID) data collection compiled by the Correlates of War Project provides information about conflicts in which one or more states threaten, display, or use force against one or more other states between 1816 and 2001. Version 2.1 of the MID data set covered the 1816-1992 period. The data collection project that culminated in version 3.0 gathered new data on all MIDs that began between 1993 and 2001, along with those MIDs that began before 1993 but were still ongoing on December 31, 1992.
Version 3.10 (released on September 26, 2007) updates the data set with corrections made after an investigation of over 200 cases where errors or discrepancies had been reported to the COW project between 2003 and 2006. Version 3.10 includes a new version of the dyadic MID data set based on the corrected underlying MID data. Since all currently reported errors and discrepancies have been investigated and either corrected, or the original data judged correct, these official dyadic MID data should be considered to supersede other dyadic MID data sets.
“Militarized interstate disputes are united historical cases of conflict in which the threat, display or use of military force short of war by one member state is explicitly directed towards the government, official representatives, official forces, property, or territory of another state. Disputes are composed of incidents that range in intensity from threats to use force to actual combat short of war” (Jones et al. 1996: 163).
In any papers or publications that utilize this data set, users are asked to give the version number and cite the article of record for the data set, as follows:
Main Bibliography Entry: Ghosn, Faten, Glenn Palmer, and Stuart Bremer. 2004. "The MID3 Data Set, 1993–2001: Procedures, Coding Rules, and Description." Conflict Management and Peace Science 21:133-154.
MID 2.1 codebook/citation. The codebook for the MID data version 3.0 builds on the documentation for the MID version 2.1 data set, which is available online: Daniel M. Jones, Stuart A. Bremer and J. David Singer (1996) ."Militarized Interstate Disputes, 1816-1992: Rationale, Coding Rules, and Empirical Patterns." Conflict Management and Peace Science, 15(2): 163:213.
The files associated with the MID 3.0 data set can be obtained either individually, or in one ZIP file that contains several files. All data files are in .csv (comma-delimited) format. In this format, values are separated by commas, with string values (e.g. state names) in quotations. The first line of each data file is a header record containing the variable names.
MID-level data and documents:
|MID_v3.0.codebook.pdf||Main codebook for the MID 3.0 data set, describing file formats and listing variables contained in the MIDA and MIDB data files.|
|MID_v3.0.associated document.pdf||Auxiliary information about the MID 3.0 data set, including discussion of new and changed variables, updates, and forthcoming MID-related data sets.|
|MIDA_3.10.csv||Data on MIDs from 1816-2001, at the dispute level. Contains one record per militarized dispute.|
|MIDB_310.csv||Data on MIDs from 1816-2001, at the participant level. Contains one record per militarized dispute participant.|
|MID_v3.0.narratives.pdf||Narratives for MIDs containing a brief prose summary of key actors and actions.|
Incident-level data and documents:
|Codebook for MID Incident Data.pdf||Main codebook for the MID 3.0 incident data sets, describing file formats and listing variables contained in the MIDI and MIDIP data files.|
|MIDI_3.10.csv||Data on incidents within MIDs from 1993-2001 (along with disputes ongoing as of 12/31/1992), at the incident level. Contains one record per militarized incident.|
|MIDIP_3.10.csv||Data on incidents within MIDs from 1993-2001 (along with disputes ongoing as of 12/31/1992), at the incident-participant level. Contains one record per participant in each incident.|
Dyadic MID data and documentation:
|Codebook for Dyadic MID Data v3.10.pdf||Main codebook for the dyadic version of the MID 3.0 data set, describing coding procedures and the dyadic file format, and listing variables.|
|MIDDyadic_3.10.csv||Data on dyadic MIDs from 1993-2001 (along with disputes ongoing as of 12/31/1992), at the dyad level. Contains one record per dyadic MID.|
Documents discussing data changes:
|Discussion - MID changes as of v3.10.pdf||Document discussing changes made to MID data since v3.02.|
|Discussion - MIDs reviewed and unchanged as of v3.10.pdf||Document discussing changes/questions examined, but where changes were not needed.|
Source Data for MID 3.0: The source data used to code the MID 3.0 data set can be obtained either individually, or in one ZIP file that contains several files.
|MID 3.0 SourceData Codebook.pdf||Main codebook for the sources used in MID 3.0 data set, listing variables.|
|MID 3.0 Standard Source Abbreviations.pdf||Main codebook for the sources used in MID 3.0 data set, listing variables.|
|Data on sources used to code incidents in MIDs from 1993-2001. The number of records per incident corresponds the number of sources used to code any given incident.|
Source Data for MID 2.1: The source data used to code the MID 2.1 data set can be obtained either individually, or in one ZIP file that contains several files.
|MID 2.1 SourceData Codebook.pdf||Main codebook for the sources used in MID 2.1 data set, providing historical overview of the project and listing variables.|
|MID2.1_SpecificSources.csv||Data on sources used to code incidents in MIDs prior to 1993. The number of records per MID corresponds the number of sources used to code any given dispute.|
|MID2.1_GeneralSources.csv||Data on sources used to code MIDs prior to 1993. The file contains the full names for sources which are abbreviated in the source data file, and sources contained in the COW MID bibliography that do not correspond to specific MID numbers.|
Version 3.0 of the Correlates of War Inter-State War data set is matched to Version 3.10 of the Militarized Interstate Dispute (MID) data set. Each interstate war between 1816 -1997 has its corresponding dispute. This report is available for download here.
Dyadic MID data is only available from the Correlates of War project from 1993-2001, because incident data (showing direct dyadic interaction) has only been systematically coded since 1993. For the pre-1993 period, either assumptions must be made in coding dyadic interaction (critically, that all states on opposite sides interacted), or additional research must be performed to identify actual interactions. In addition, coding to a dyadic form must carefully check dates of state involvement to verify that states were opponents at the same time.
MID v.2.1 (running from 1816-1992):
|MID 2.1.zip||The .zip file contains main codebook in .txt format and three data files in .txt format.|
MID v.2.1EE provides information on a subset of escalatory incidents in 1816-1992:
|MID 2.1 EE.zip||The .zip file contains main codebook in .pdf format and the data file in .csv format.|
There are two other versions of the dyadic MID data available for the pre-1992 period which tackle these issues in different ways. Extensive documentation on procedures are available in the documentation at both sites:
Scott Bennett’s EUGene software (v3.2, 2008):
|http://www.eugenesoftware.org/||EUGene generates dyadic MID data from 1816-2001 using the most recent MID data (3.1). It allows data to be formatted with several units of analysis, including dyadic-dispute, dyadic-dispute-year, and dyad-year formats, each directed or nondirected. EUGene constructs dyads of states involved on opposite sides at the same time, but does not add new historical research.|
Zeev Maoz’s dyadic MID data (v2.0, 2005):
|http://psfaculty.ucdavis.edu/zmaoz/dyadmid.html/||The data set incorporates historical research on individual dyads rather than just taking all possible dyadic combinations, but does not use the most recent MID data and contains some unilateral coding changes to the data.|
On September 26, 2007, the MID data were updated to version 3.10. Updating for version 3.10 focused on the following issues:
On October 10, 2003, we replaced version 3.01 of the MID data with version 3.02. The data sets for version 3.02 include the following:
Because the new data version include numerous documentation files, we have released all documentation files in .pdf format only. Users wishing to cut and paste from these documents can still do so using the "t" keystroke command within Adobe.
A typo was discovered in the MIDA_3.02.csv data file on October 14, 2003 (the MID number for MID 21 was mistakenly listed as a 20, so it appeared that MID 20 was listed twice and MID 21 not at all). The MID number for MID 21 has been corrected in MIDA_3.021.csv, which replaces MIDA_3.02.csv. No other data files were affected by the typo.
On March 23, 2003, we replaced version 3.00 of the MID data with version 3.01. The data in the MIDA file (main MID listing) is identical from version 3.00 to version 3.01. However, we found an erroneous case in version 3.00 of the MIDB file, and have deleted this case in version 3.01 (it should not have been in there in the first place). The case was MIDB data set dispute number 4241. This is the only change from version 3.00 to version 3.01.
With this release, we have also made available text file versions of the documentation as .rtf files, along with .pdf files.
Version 3.0 was developed through a 3-year multi-university initiative supported by the National Science Foundation. The project would not have been completed without the participation of co-PIs Scott Bennett, Stuart Bremer, Paul Diehl, Dan Geller, Doug Gibler, Paul Hensel, Chuck Gochman, Zeev Maoz, Glenn Palmer, Brian Pollins, Jim Ray, Pat Regan, and Ric Stoll. We have preserved the key documents used during the project's data creation phase. To access these documents, or to review the participants in the project, select among the following links:
The militarized dispute data are hosted by Glenn Palmer, Pennsylvania State University, under the COW Data Set Hosting Program. In case of questions or concerns concerning the data or coding rules, he may be contacted by email at firstname.lastname@example.org.