These contain an abbreviated version of the "master records" for the Correlates of War direct contiguity data. Data contain a few cosmetic changes to assist with some functions downstream from it.

## Usage

cow_contdir

## Format

A data frame with 2025840 observations on the following 4 variables.

ccode1

a numeric vector for the Correlates of War state code for the first state

ccode2

a numeric vector for the Correlates of War state code for the second state

conttype

a numeric vector for the contiguity relationship

begin

the year-month when this contiguity relationship begins (YYYYMM)

end

the year-month when this contiguity relationship ends (YYYYMM)

## Details

The "master record" provided by the Correlates of War is "non-directed." I make these data "directed" for convenience.

For clarity, the contiguity codes range from 1 to 5. 1 = direct land contiguity. 2 = separated by 12 miles of water or fewer (a la Stannis Baratheon). 3 = separated by 24 miles of water or fewer (but more than 12 miles). 4 = separated by 150 miles of water or fewer (but more than 24 miles). 5 = separated by 400 miles of water or fewer (but more than 150 miles). Cases of separation by more than 400 miles of water are not included in the master record (but are easily discerned based on complete dyad-year data).

## References

Stinnett, Douglas M., Jaroslav Tir, Philip Schafer, Paul F. Diehl, and Charles Gochman (2002). "The Correlates of War Project Direct Contiguity Data, Version 3." Conflict Management and Peace Science 19 (2):58-66.