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I use a number of statistics to describe these networks such as the quantity of legislation sponsored and cosponsored by each legislator, the number of legislators cosponsoring each piece of legislation, the total number of legislators who have cosponsored bills written by a given legislator, and network measures of closeness, betweenness, and eigenvector centrality. I then introduce a new measure I call ‘‘connectedness’’ which uses information about the frequency of cosponsorship and the number of cosponsors on each bill to make inferences about the social distance between legislators. Connectedness predicts which members will pass more amendments on the floor, a measure that is commonly used as a proxy for legislative influence. It also predicts roll call vote choice even after controlling for ideology and partisanship."}}]},{"typeName":"publication","multiple":true,"typeClass":"compound","value":[{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H.  Fowler. 2006. \"Connecting the Congress: A Study of Cosponsorship Networks.\" Political Analysis, 14 (4), 456-487: doi:10.1093/pan/mpl002. <a href= \"http://jhfowler.ucsd.edu/best_connected_congressperson.pdf\" target= \"_new\">article available here</a>"}},{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H.  Fowler. 2006. \"Connecting the Congress: A Study of Cosponsorship Networks.\" Political Analysis, 14 (4), 456-487: doi:10.1093/pan/mpl002. <a href= \"http://jhfowler.ucsd.edu/best_connected_congressperson.pdf\" target= \"_new\">article available here</a>"}},{"publicationCitation":{"typeName":"publicationCitation","multiple":false,"typeClass":"primitive","value":"James H. Fowler. 2004. \"Legislative Cosponsorship Networks in the U.S. House and Senate.\" Social Networks, 28 (4), 454-465: doi:10.1016/j.socnet.2005.11.003. <a href= \"http://dvn.iq.harvard.edu/dvn/dv/jhfowler/faces/study/StudyPage.jsp?studyId=7094\" target= \"_new\">study available here</a>"}}]},{"typeName":"productionDate","multiple":false,"typeClass":"primitive","value":"2006"},{"typeName":"distributor","multiple":true,"typeClass":"compound","value":[{"distributorName":{"typeName":"distributorName","multiple":false,"typeClass":"primitive","value":"James H. 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