Network Paerns of Legislative Collaboration in Twenty Parliaments Franc¸ois Briae
[email protected] Supplementary online material is appendix contains detailed information on the data and networks briey documented in the short note “Network Paerns of Legislative Collaboration in Twenty Parliaments”. Section A starts by reviewing the existing literature on legislative cosponsorship as a strategic position-taking device for legis- lators within parliamentary chambers. Section B then documents the data collection process, Section C summarises its results, and Section D contains the full list of party abbreviations used in the data. Section E fully documents how the cosponsorship networks were constructed and weighted, and lists some derived measures. e replication material for this study is available at https://github.com/ briatte/parlnet. e code was wrien in R (R Core Team, 2015), and the cur- rent release of the repository is version 2.6. See the README le of the reposi- tory for detailed replication instructions including package dependencies. e raw data up to January 2016 are available at doi:10.5281/zenodo.44440. CONTENTS A Background information on legislative cosponsorship . 2 B Sample denition and data collection . 4 B.1 Bills . 4 B.2 Sponsors . 10 C Descriptive statistics by country, chamber and legislature . 11 D Party abbreviations and Le/Right scores . 17 E Cosponsorship network construction . 27 E.1 Edge weights . 28 E.2 Network objects . 30 E.3 Network descriptors . 31 References . 35 1 A. BACKGROUND INFORMATION ON LEGISLATIVE COSPONSORSHIP Legislative scholarship oers a wealth of studies that stress the importance of collabo- ration between Members of Parliament (MPs) in the lawmaking process.