@
data coded by Gary King.  rows with missing values are commented out.

year  (1816-1965)
warst = the number of wars started in this year.
warun = the number of wars underway in this year
ntns = number of nations involved in war
allian = % of nations in system in alliances of any sort.  missing for war
        years: 1915-1919, 1940-1945.

ALLIAN come from J. david singer and melvin small (1966) "formal alliances,
1815-1939: a quantitative description," in Journal of peace research. vol 1.:
1-31.  and J. david singer and melvin small (1969) "formal alliances, 1816-65:
an extension of the basic data" journal of peace research. vol 3: 256-282.

WARST, WARUN, AND NTNS come from J. david singer and melvin small (1972) wages
of war: 1816-1965, a statistical handbook.  new york: wiley.
@

input yrwar.asc;
invar year,warst,warun,ntns,allian;
output yrwar;
outtyp f;