Abstract
Abstract Advances in research on national and local influence structures suggest that comparative study of the relationships among the influential in the context of the centralization of power and decision-making is both possible and fruitful. Techniques based on graph theory may be used to operationalize the concept of centralization. We applied Nieminen's (1973) index of centrality to a sample of the elite of the Valle region of Columbia. Positional, reputational and decisional methods were combined to select the sample, and relationships among respondents in a regionally active core of the elite were mapped from the organizational affiliations they had in common. The adjacency matrix produced by these data showed that direct links among the leaders were structured by organizational brokers in several of the seven cities in the region. The derivative distance matrix and index of centrality incorporate the indirect relationships that exist. All but one person in the sector are closely interrelated in a n...
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