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Behavior Research Methods

, Volume 46, Issue 1, pp 240–253 | Cite as

ESCOLEX: A grade-level lexical database from European Portuguese elementary to middle school textbooks

  • Ana Paula SoaresEmail author
  • José Carlos Medeiros
  • Alberto Simões
  • João Machado
  • Ana Costa
  • Álvaro Iriarte
  • José João de Almeida
  • Ana P. Pinheiro
  • Montserrat Comesaña
Article

Abstract

In this article, we introduce ESCOLEX, the first European Portuguese children’s lexical database with grade-level-adjusted word frequency statistics. Computed from a 3.2-million-word corpus, ESCOLEX provides 48,381 word forms extracted from 171 elementary and middle school textbooks for 6- to 11-year-old children attending the first six grades in the Portuguese educational system. Like other children’s grade-level databases (e.g., Carroll, Davies, & Richman, 1971; Corral, Ferrero, & Goikoetxea, Behavior Research Methods, 41, 1009–1017, 2009; Lété, Sprenger-Charolles, & Colé, Behavior Research Methods, Instruments, & Computers, 36, 156–166, 2004; Zeno, Ivens, Millard, Duvvuri, 1995), ESCOLEX provides four frequency indices for each grade: overall word frequency (F), index of dispersion across the selected textbooks (D), estimated frequency per million words (U), and standard frequency index (SFI). It also provides a new measure, contextual diversity (CD). In addition, the number of letters in the word and its part(s) of speech, number of syllables, syllable structure, and adult frequencies taken from P-PAL (a European Portuguese corpus-based lexical database; Soares, Comesaña, Iriarte, Almeida, Simões, Costa, …, Machado, 2010; Soares, Iriarte, Almeida, Simões, Costa, França, …, Comesaña, in press) are provided. ESCOLEX will be a useful tool both for researchers interested in language processing and development and for professionals in need of verbal materials adjusted to children’s developmental stages. ESCOLEX can be downloaded along with this article or from http://p-pal.di.uminho.pt/about/databases.

Keywords

Children lexical databases Word frequency Child language processing Reading Literacy 

Notes

Author note

This work is part of the research project “Procura-PALavras (P-PAL): A software program for deriving objective and subjective psycholinguistic indices for European Portuguese words” (PTDC/PSI-PCO/104679/2008), funded by FCT (Fundação para a Ciência e Tecnologia), by FEDER (Fundo Europeu de Desenvolvimento Regional) through the European programs QREN (Quadro de Referência Estratégico Nacional), and by COMPETE (Programa Operacional Factores de Competitividade). We are grateful to Porto Editora for providing the textbooks without which ESCOLEX would not have been possible.

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Copyright information

© Psychonomic Society, Inc. 2013

Authors and Affiliations

  • Ana Paula Soares
    • 1
    Email author
  • José Carlos Medeiros
    • 4
  • Alberto Simões
    • 2
  • João Machado
    • 1
  • Ana Costa
    • 1
  • Álvaro Iriarte
    • 2
  • José João de Almeida
    • 3
  • Ana P. Pinheiro
    • 1
  • Montserrat Comesaña
    • 1
  1. 1.School of Psychology, University of MinhoMinhoPortugal
  2. 2.Centre for Humanistic Studies, University of MinhoMinhoPortugal
  3. 3.Computer Science and Technology Center, University of MinhoMinhoPortugal
  4. 4.Porto EditoraPortoPortugal

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