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Article published In: ITL - International Journal of Applied Linguistics
Vol. 166:2 (2015) ► pp.278–306

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Assessing vocabulary size through multiple-choice formats

Issues with guessing and sampling rates

 | Lund University
 | University of Nottingham
Published online: 21 January 2016
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https://doi.org/10.1075/itl.166.2.04gyl
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.
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2016. Exploring the Mental Lexicon of the Multilingual: Vocabulary Size, Cognate Recognition and Lexical Access in the L1, L2 and L3. Eurasian Journal of Applied Linguistics 2:2 ► pp. 1 ff. DOI logo
[no author supplied]
2022. Research Methods in Vocabulary Studies [Research Methods in Applied Linguistics, 2], DOI logo

This list is based on CrossRef data as of 30 march 2026. Please note that it may not be complete. Sources presented here have been supplied by the respective publishers. Any errors therein should be reported to them.

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