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March 2014 Concise comparative summaries (CCS) of large text corpora with a human experiment
Jinzhu Jia, Luke Miratrix, Bin Yu, Brian Gawalt, Laurent El Ghaoui, Luke Barnesmoore, Sophie Clavier
Ann. Appl. Stat. 8(1): 499-529 (March 2014). DOI: 10.1214/13-AOAS698

Abstract

In this paper we propose a general framework for topic-specific summarization of large text corpora and illustrate how it can be used for the analysis of news databases. Our framework, concise comparative summarization (CCS), is built on sparse classification methods. CCS is a lightweight and flexible tool that offers a compromise between simple word frequency based methods currently in wide use and more heavyweight, model-intensive methods such as latent Dirichlet allocation (LDA). We argue that sparse methods have much to offer for text analysis and hope CCS opens the door for a new branch of research in this important field.

For a particular topic of interest (e.g., China or energy), CSS automatically labels documents as being either on- or off-topic (usually via keyword search), and then uses sparse classification methods to predict these labels with the high-dimensional counts of all the other words and phrases in the documents. The resulting small set of phrases found as predictive are then harvested as the summary.

To validate our tool, we, using news articles from the New York Times international section, designed and conducted a human survey to compare the different summarizers with human understanding. We demonstrate our approach with two case studies, a media analysis of the framing of “Egypt” in the New York Times throughout the Arab Spring and an informal comparison of the New York Times’ and Wall Street Journal’s coverage of “energy.” Overall, we find that the Lasso with $L^{2}$ normalization can be effectively and usefully used to summarize large corpora, regardless of document size.

Citation

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Jinzhu Jia. Luke Miratrix. Bin Yu. Brian Gawalt. Laurent El Ghaoui. Luke Barnesmoore. Sophie Clavier. "Concise comparative summaries (CCS) of large text corpora with a human experiment." Ann. Appl. Stat. 8 (1) 499 - 529, March 2014. https://doi.org/10.1214/13-AOAS698

Information

Published: March 2014
First available in Project Euclid: 8 April 2014

zbMATH: 06302245
MathSciNet: MR3192000
Digital Object Identifier: 10.1214/13-AOAS698

Keywords: co-occurrence , high-dimensional analysis , L1 regularized logistic regression , L2 normalization , Lasso , sparse modeling , Text summarization , tf-idf

Rights: Copyright © 2014 Institute of Mathematical Statistics

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Vol.8 • No. 1 • March 2014
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