COW MID Location, 1816-2001 (v1.1)

Overview

The Militarized Interstate Dispute Location (MIDLOC) dataset details the precise geographic onset location of Militarized Interstate Disputes (MIDs) in the post-Napoleonic era (from 1816-2001).  The MIDLOC data offer a single point location to represent the onset of each individual MID between 1816 and 1992.  For the period 1993-2001, the data are more detailed, identifying a single point location for individual incidents within each MID.  Following common convention, latitude and longitude point coordinates are recorded for each observation.  Latitude is measured as the angular distance, in decimalized degrees (DD), of a point north or south of the equator.  Similarly, longitude is measured as the angular distance, in decimalized degrees (DD), of a point east or west of the Prime (Greenwich) Meridian.

There are a total of 3865 individual MIDLOC records. This is comprised of recorded onset locations for 2240 of 2332 independent MIDs from the MID 3.0 dataset—96% data coverage. 1939 of these 2240 took place between 1816 and 1992 and 301 between 1993 and 2001.  In addition to the MID-level data, this dataset also includes incident-level location data for the period 1993-2001.  There are 2122 incident-level records that comprise the 301 MIDs during this period.  196 of these 2122 records currently contain missing values.  Of these, however, only 3 are missing locations for the onset incident within the MID.

Citation

In any papers or publications that utilize this data set, users are asked to give the version number and cite the data set, as follows:

Bibliography Entry: Braithwaite, Alex. 2010. “MIDLOC: Introducing the Militarized Interstate Dispute (MID) Location Dataset.” Journal of Peace Research 47(1): 91-98.

 


Data Set

The data are distributed in a flat text, comma-separated-variable (.csv) file.  All text variables (MID21Location,  MIDLOClocation) are enclosed in quotation marks.  By default under Microsoft Windows, .csv files will open in Microsoft Excel.  But the file may be opened in any program that reads text.  In the statistical analysis program Stata, the file may be easily loaded using the command “insheet using MIDLOC_1.0.csv”. Note that values of -9 or -9999 designate missing values, and must be treated as such for appropriate analysis.

The zip file (MIDLOC_v1.1.zip) contains two separate data files:

MIDLOC_1.1.csv Data on the Militarized Interstate Dispute Location , 1816-2001.
MIDLOC_v1.1_codebook.pdf Documentation for the data set.

 

The variables in the data set are as follows.

Variable Contents
DispNum MID dispute number
IncidNum MID incident number
StYear Start year of dispute/incident
StMon Start month of dispute/incident
StDay Start day of dispute/incident
MID21Location Text comment on location of dispute or incident provided by coders of MID 2.1/MID 3.0 projects
MIDLOClocation Most precise known location from which MIDLOC observation is coded
Longitude Longitude in decimalized degrees
Latitude Latitude in decimalized degrees
Precision Indicator of geographic precision/resolution of coded location
Onset First known incident of MID
Version Version 1.0 of MIDLOC dataset



Descriptive Statistics for MIDLOC_1.0.csv

Variable Name
Number of Observations
Mean Value
Standard Deviation
Minimum Value
Maximum Value
Missing Value
DispNum
4153
3180.445
1242.906
2
4344
-9
IncidNum
4153
3180468
1242924
2001
4344001
-9
StYear
4153
1971.557
38.15599
1816
2001
-9
StMon
4153
6.357332
3.473119
1
12
-9
StDay
4153
13.03997
11.01634
-9
31
-9
Longitude
4153
-668.6354
2547.323
-9999
76
-9999
Latitude
4153
-662.9013
2549.421
-9999
177.4833
-9999
Precision
4153
3.523718
1.591457
1
7
-9
Onset
4153
0.5615218
0.4962604
0
1
-9
Version
4153
1
0
1
1
-9

 


Changes in v1.1

On August 4, 2010, v.1.1 of the MID Location data was released. V.1.1 corrects a mislabeling of the latitude and longitude variables.


Questions and Feedback

The contiguity data sets are hosted by Alex Braithwaite, University College London, 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 alex.braithwaite@ucl.ac.uk.