Estimating the Ideology of Japanese Politicians, Political Commentators, Political Parties, and News Media Using Twitter Data

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  • Twitterデータによる日本の政治家・言論人・政党・メディアのイデオロギー位置の推定
  • 独立論文 Twitterデータによる日本の政治家・言論人・政党・メディアのイデオロギー位置の推定
  • ドクリツ ロンブン Twitter データ ニ ヨル ニホン ノ セイジカ ・ ゲンロンジン ・ セイトウ ・ メディア ノ イデオロギー イチ ノ スイテイ

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Abstract

This study estimates the ideology of Japanese politicians, political commentators, political parties, and news media using Twitter data. While previous studies have utilized various methods to measure the ideology of political actors, the method using Twitter data has many advantages, one of which is that we can estimate the ideology of local politicians and political commentators. The statistical model adopted here assumes that general Twitter users prefer to follow the accounts of political actors whose position is close to theirs and estimates the ideal points of both the political actors and general users based on whether or not the general users follow the accounts of the political actors. I estimated the ideological positions of 70 members of the House of Representatives, 46 members of the House of Councillors, 10 parties and other political institutions, 6 newspaper companies, 39 local politicians and former politicians, and 41 political commentators. The estimation results can be considered to be valid because Twitter-based ideal points of the Diet members are highly correlated with their positions estimated by data from an elite survey.

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