Lexical Diversity in Writing and Speaking Task Performances

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Lexical density and readability: A case study of English Textbooks (2013, background): “It is worth noting that lexical density in written and spoken languages has been compared (Belinda, 2007; Halliday, 1985b; Yu, 2007).”
The Development of Complexity, Accuracy, and Fluency in Second Language Performance: A Longitudinal Study (2017, methodology): “D was chosen for its ability to reliably compare texts of different lengths, even relatively short texts (Durán et al. 2004), and it has been shown to be a useful measure for L2 data (TreffersDaller 2009; Yu 2010).”
Capturing the Diversity in Lexical Diversity. (2013, background): “In the meantime, one of the most influential contributions to the debate about the measurement of the repetition rate came from the British statistician George Udny Yule. After his retirement, Yule developed an interest in the special problems and sources of fallacy faced in the statistical analysis”
The Relationship of Lexical Richness to the Quality of ESL Learners' Oral Narratives. (2012, background): “The L2 testing and assessment literature, in contrast, has focused primarily on evaluating the relationship between lexical richness and the quality of learners' writing or speaking task performance (Laufer & Nation, 1995; Vermeer, 2000; Yu, 2010).”