語彙サイズテストの結果の解釈と読解力の予測 : 語彙知識推定への3つのアプローチ

概要

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This study addresses the interpretation of the results of vocabulary size tests with reading proficiency estimation in mind. Despite the number of vocabulary size tests developed so far, how the raw scores should be interpreted, or put into a formula, to obtain estimated vocabulary size of L2 learners seems to leave room for improvement. In this study, three different interpretive approaches, namely the 'level,' 'size,' and 'confidence' interpretations were compared in terms of resulting estimated vocabulary sizes and their correlative strength with reading proficiency. According to test results for 162 Japanese university students, the study found that the size-approach yielded the largest estimated vocabulary size of 5442.77 words in average. It was also found that the vocabulary size calculated using a confidence-based approach showed the strongest correlation with L2 reading proficiency, followed by a size-based approach with a slightly lower correlation coefficient. The results indicated that although comparatively new, the confidence-based approach holds potential for estimating vocabulary size as well as reading proficiency, and the traditional 'size' interpretation was deemed as the most practical choice for the time being.
全国英語教育学会の論文