Early inquiries into the statistical properties of natural language found that words tend to occur with power-law frequencies. This observation, closely associated with Zipf's law, has spurred many investigations into why this power-law pattern emerges with such regularity. Rarely, however, has this property of text been leveraged in statistical inference. In this paper, we demonstrate that the Latent Dirichlet Allocation (LDA) model can accommodate power-law word frequencies. In particular, when the document length distribution is regularly varying, the word frequency distribution admits a hierarchy of power laws across documents and topics. We further leverage this finding to develop an efficient tensor decomposition algorithm for estimating the topic matrix via the moments of normalized extreme word frequencies. Applying our algorithm to the twenty newsgroups corpus reveals that the extreme-value methodology exhibits robustness to certain choices made in the pre-processing of the data. This work furthers the recent interest in adapting machine learning methods to the study of multivariate extremes.

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