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Understanding the role of text length, sample size and vocabulary size in determining text coverage

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Title:Understanding the role of text length, sample size and vocabulary size in determining text coverage
Authors:Chujo, Kiiyomi
Utiyama, Masao
Keywords:text coverage
sample size
text length
vocabulary size
standard deviation
show 1 moresampling methodology
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Date Issued:Apr 2005
Publisher:University of Hawaii National Foreign Language Resource Center
Center for Language & Technology
Abstract:Although the use of "text coverage" to measure the intelligibility of reading materials is increasing in the field of vocabulary teaching and learning, to date there have been few studies which address the methodological variables that can affect reliable text coverage calculations. The objective of this paper is to investigate how differing vocabulary size, text length, and sample size might affect the stability of text coverage, and to define relevant parameters. In this study, 23 varying vocabulary sizes taken from the high frequency words of the British National Corpus and 26 different text lengths taken from the Time Almanac corpus were analyzed using 10 different sample sizes in 1,000 iterations to calculate text coverage, and the results were analyzed using the distribution of the mean score and standard deviation. The results of the study empirically demonstrate that text coverage is more stable when the vocabulary size is larger, the text length is longer, and more samples are used. It was also found that the stability of text coverage is greater from a larger number of shorter samples than from a fewer number of longer samples. As a practical guideline for educators, a table showing minimum parameters is included for reference in computing text coverage calculations.
Appears in Collections: Volume 17, No. 1

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