Assessing vocabulary size through multiple-choice formats: issues with guessing and sampling rates

Gyllstad, Henrik and Vilkaitė, Laura and Schmitt, Norbert (2015) Assessing vocabulary size through multiple-choice formats: issues with guessing and sampling rates. ITL - International Journal of Applied Linguistics, 166 (2). pp. 278-306. ISSN 1783-1490

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Abstract

In most tests of vocabulary size, knowledge is assessed through multiple-choice formats. Despite advantages such as ease of scoring, multiple-choice tests (MCT) are accompanied with problems. One of the more central issues has to do with guessing and the presence of other construct-irrelevant strategies that can lead to overestimation of scores. A further challenge when designing vocabulary size tests is that of sampling rate. How many words constitute a representative sample of the underlying population of words that the test is intended to measure? This paper addresses these two issues through a case study based on data from a recent and increasingly used MCT of vocabulary size: the Vocabulary Size Test. Using a criterion-related validity approach, our results show that for multiple-choice items sampled from this test, there is a discrepancy between the test scores and the scores obtained from the criterion measure, and that a higher sampling rate would be needed in order to better represent knowledge of the underlying population of words. We offer two main interpretations of these results, and discuss their implications for the construction and use of vocabulary size tests.

Item Type: Article
Additional Information: c. John Benjamins Publishing Company. Published: Gyllstad, Henrik and Vilkaitė, Laura and Schmitt, Norbert. Assessing vocabulary size through multiple-choice formats: issues with guessing and sampling rates in ITL - International Journal of Applied Linguistics 166.2 (1995): 278-306.
Keywords: Vocabulary Size, Multiple-Choice Test, Guessing, Sampling Rate, Assessment, Validation, Testing, Criterion-Related Validity
Schools/Departments: University of Nottingham UK Campus > Faculty of Arts > School of English
Identification Number: https://doi.org/10.1075/itl.166.2.04gyl
Depositing User: Eprints, Support
Date Deposited: 14 Mar 2016 14:39
Last Modified: 14 Sep 2016 14:38
URI: http://eprints.nottingham.ac.uk/id/eprint/32284

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