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

dc.contributor.author Chujo, Kiiyomi
dc.contributor.author Utiyama, Masao
dc.date.accessioned 2020-05-22T02:00:33Z
dc.date.available 2020-05-22T02:00:33Z
dc.date.issued 2005-04
dc.description.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.
dc.identifier.doi 10125/66598
dc.identifier.issn 1539-0578
dc.identifier.uri http://hdl.handle.net/10125/66598
dc.publisher University of Hawaii National Foreign Language Resource Center
dc.publisher Center for Language & Technology
dc.subject text coverage
dc.subject sample size
dc.subject text length
dc.subject vocabulary size
dc.subject standard deviation
dc.subject sampling methodology
dc.title Understanding the role of text length, sample size and vocabulary size in determining text coverage
dc.type Article
dc.type.dcmi Text
local.rfl.topic Lexis
prism.endingpage 22
prism.number 1
prism.startingpage 1
prism.volume 17
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