Abstract
The article focuses on two problems in the measurement of integration with transaction data. The first is the analysis procedure by which the transaction data are summarized. Different procedures affect the data in such different ways that they can actually lead to contradictory conclusions about the progress of integration. This article spells out some of the major differences in the models of analysis. The second problem is validity of transaction data as measures of integration. There are numerous different conceptualizations of integration, some centering on the development of central institutions, others on the existence of favorable attitudes among people, and still others on the existence of a highly co-operative relationship among states. It is not clear that transaction data are the most appropriate measure of any of these concepts.