A Structural Text-Based Scaling Model for Analyzing Political Discourse

• URL: http://arxiv.org/abs/2410.11897v1
• Date: Mon, 14 Oct 2024 14:05:35 GMT
• Title: A Structural Text-Based Scaling Model for Analyzing Political Discourse
• Authors: Jan Vávra, Bernd Hans-Konrad Prostmaier, Bettina Grün, Paul Hofmarcher,
• Abstract summary: We introduce the Structural Text-Based Scaling model to infer ideological positions of speakers for latent topics from text data. Applying STBS to U.S. Senate speeches, we identify immigration and gun violence as the most polarizing topics between the two major parties in Congress.
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• Abstract: Scaling political actors based on their individual characteristics and behavior helps profiling and grouping them as well as understanding changes in the political landscape. In this paper we introduce the Structural Text-Based Scaling (STBS) model to infer ideological positions of speakers for latent topics from text data. We expand the usual Poisson factorization specification for topic modeling of text data and use flexible shrinkage priors to induce sparsity and enhance interpretability. We also incorporate speaker-specific covariates to assess their association with ideological positions. Applying STBS to U.S. Senate speeches from Congress session 114, we identify immigration and gun violence as the most polarizing topics between the two major parties in Congress. Additionally, we find that, in discussions about abortion, the gender of the speaker significantly influences their position, with female speakers focusing more on women's health. We also see that a speaker's region of origin influences their ideological position more than their religious affiliation.

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