Policy positions in the chilean senate: an analysis of coauthorship and roll call data

this paper examines the policy positions of chilean senators. the empirical analysis focuses on two different legislative activities: voting and coauthoring bills. the roll call analysis evaluates the degree to which coalitions act as cohesive policy teams on the floor of congress, whether parties' positions match conventional ideological rankings, and the dimensionality of voting decisions. the coauthorship analysis provides alternative ideal points to examine similar questions. the findings of the voting analysis reveal a rather unidimensional world with two distinct clusters matching coalitional affiliation, while the analysis of coauthorship illuminates a more complex pattern of associations. neither roll call votes nor coauthorship patterns, however, reveal substantive fissures within the governing coalition. in comparison, the opposition coalition appears more divided along partisan lines.