Schmitt, N., Jiang, X. Y., & Grabe, W. (2011). The percentage of words known in a text and reading comprehension. The Modern Language Journal, 95, 26-43.
摘要：This study focused on the relationship between percentage of vocabulary known in a text and level of comprehension of the same text. Earlier studies have estimated the percentage of vocabulary necessary for second language learners to understand written texts as being between 95% (Laufer, 1989) and 98% (Hu & Nation, 2000). In this study, 661 participants from 8 countries completed a vocabulary measure based on words drawn from 2 texts, read the texts, and then completed a reading comprehension test for each text. The results revealed a relatively linear relationship between the percentage of vocabulary known and the degree of reading comprehension. There was no indication of a vocabulary "threshold," where comprehension increased dramatically at a particular percentage of vocabulary knowledge. Results suggest that the 98% estimate is a more reasonable coverage target for readers of academic texts. Adapted from the source document
关键词：applied linguistics, reading readiness/acquisition/achievement, Reading Comprehension, Second Language Learning, Reading Tests, Vocabulary Size
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