arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.06161cs.CLcs.IRcs.LGstat.ML
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使用NLP来衡量民主

Using NLP to measure democracy

Conselho Administrativo de Defesa Econômica(经济防御行政委员会)

Thiago Marzagão

摘要:

本文使用自然语言处理创建了第一个机器编码的民主指数,我称之为自动民主评分(ADS)。ADS基于来自6,043个不同来源的4,200万篇新闻文章,涵盖1993 - 2012年期间所有独立国家。与我们今天的民主指数不同,ADS是可复制的,标准误差小到足以区分不同的情况。通过监督学习产生ADS。尝试了三种方法:a)潜在语义分析和基于树的回归方法的组合; b)潜在狄利克雷分配和基于树的回归方法的组合;以及c)单词分数算法。Wordscores算法优于其他算法,因此它是ADS的基础。有一个Web应用程序,任何人都可以更改训练集并查看结果如何变化:www.example.com

英文摘要:

This paper uses natural language processing to create the first machine-coded democracy index, which I call Automated Democracy Scores (ADS). The ADS are based on 42 million news articles from 6,043 different sources and cover all independent countries in the 1993-2012 period. Unlike the democracy indices we have today the ADS are replicable and have standard errors small enough to actually distinguish between cases. The ADS are produced with supervised learning. Three approaches are tried: a) a combination of Latent Semantic Analysis and tree-based regression methods; b) a combination of Latent Dirichlet Allocation and tree-based regression methods; and c) the Wordscores algorithm. The Wordscores algorithm outperforms the alternatives, so it is the one on which the ADS are based. There is a web application where anyone can change the training set and see how the results change: democracy-scores.org

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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