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arXiv 1607.03055cs.CLcs.CY
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Exploring the Political Agenda of the European Parliament Using a Dynamic Topic Modeling Approach

Insight Centre for Data Analytics(洞察数据分析中心);School of Computer Science, University College Dublin(都柏林大学计算机科学学院);School of Politics & International Relations, University College Dublin(都柏林大学政治与国际关系学院)

Derek Greene, James P. Cross

英文摘要:

This study analyzes the political agenda of the European Parliament (EP) plenary, how it has evolved over time, and the manner in which Members of the European Parliament (MEPs) have reacted to external and internal stimuli when making plenary speeches. To unveil the plenary agenda and detect latent themes in legislative speeches over time, MEP speech content is analyzed using a new dynamic topic modeling method based on two layers of Non-negative Matrix Factorization (NMF). This method is applied to a new corpus of all English language legislative speeches in the EP plenary from the period 1999-2014. Our findings suggest that two-layer NMF is a valuable alternative to existing dynamic topic modeling approaches found in the literature, and can unveil niche topics and associated vocabularies not captured by existing methods. Substantively, our findings suggest that the political agenda of the EP evolves significantly over time and reacts to exogenous events such as EU Treaty referenda and the emergence of the Euro-crisis. MEP contributions to the plenary agenda are also found to be impacted upon by voting behaviour and the committee structure of the Parliament.

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