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Lexical and Hierarchical Topic Regression

2020-01-17 | |  81 |   39 |   0

Abstract

Inspired by a two-level theory from political science that unifies agenda setting and ideological framing, we propose supervised hierarchical latent Dirichlet allocation (S H L DA), which jointly captures documents’ multi-level topic structure and their polar response variables. Our model extends the nested Chinese restaurant processes to discover tree-structured topic hierarchies and uses both per-topic hierarchical and per-word lexical regression parameters to model response variables. S H L DA improves prediction on political affiliation and sentiment tasks in addition to providing insight into how topics under discussion are framed.

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