Open Access
March 2012 Context tree selection and linguistic rhythm retrieval from written texts
Antonio Galves, Charlotte Galves, Jesús E. García, Nancy L. Garcia, Florencia Leonardi
Ann. Appl. Stat. 6(1): 186-209 (March 2012). DOI: 10.1214/11-AOAS511


The starting point of this article is the question “How to retrieve fingerprints of rhythm in written texts?” We address this problem in the case of Brazilian and European Portuguese. These two dialects of Modern Portuguese share the same lexicon and most of the sentences they produce are superficially identical. Yet they are conjectured, on linguistic grounds, to implement different rhythms. We show that this linguistic question can be formulated as a problem of model selection in the class of variable length Markov chains. To carry on this approach, we compare texts from European and Brazilian Portuguese. These texts are previously encoded according to some basic rhythmic features of the sentences which can be automatically retrieved. This is an entirely new approach from the linguistic point of view. Our statistical contribution is the introduction of the smallest maximizer criterion which is a constant free procedure for model selection. As a by-product, this provides a solution for the problem of optimal choice of the penalty constant when using the BIC to select a variable length Markov chain. Besides proving the consistency of the smallest maximizer criterion when the sample size diverges, we also make a simulation study comparing our approach with both the standard BIC selection and the Peres–Shields order estimation. Applied to the linguistic sample constituted for our case study, the smallest maximizer criterion assigns different context-tree models to the two dialects of Portuguese. The features of the selected models are compatible with current conjectures discussed in the linguistic literature.


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Antonio Galves. Charlotte Galves. Jesús E. García. Nancy L. Garcia. Florencia Leonardi. "Context tree selection and linguistic rhythm retrieval from written texts." Ann. Appl. Stat. 6 (1) 186 - 209, March 2012.


Published: March 2012
First available in Project Euclid: 6 March 2012

zbMATH: 1235.68305
MathSciNet: MR2951534
Digital Object Identifier: 10.1214/11-AOAS511

Keywords: BIC , European and Brazilian Portuguese , linguistic rhythm , Model selection , smallest maximizer criterion , variable length Markov chains

Rights: Copyright © 2012 Institute of Mathematical Statistics

Vol.6 • No. 1 • March 2012
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