Abstract
What do the growing number of events data research efforts have in common? Is there sufficient compatibility among the extant data collections to combine the data files from different research enterprises? Is the achievement of such compatibility desirable? Four extant events data projects are examined to determine the extent to which there is agreement with regard to the identification and description of international behavior. Following a comparison of the assumptions underlying the constructed typologies employed by each, a “ trial marriage “ is undertaken to provide an empirical test of compatibility in practice. The results indicate that there is sufficient consensus with regard to the identification of an international event and its key components to refer to an “ events data community,” but that differences in the description of international events lead to little compatibility in practice.

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