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Psychometric Evaluation Of Lexical Diversity Indices: Assessing Length Effects, Gerasimos Fergadiotis, Heather Harris Wright, Samuel B. Green
Psychometric Evaluation Of Lexical Diversity Indices: Assessing Length Effects, Gerasimos Fergadiotis, Heather Harris Wright, Samuel B. Green
Speech and Hearing Sciences Faculty Publications and Presentations
Purpose—Several novel techniques have been developed recently to assess the breadth of speaker’s vocabulary exhibited in a language sample. The specific aim of this study was to increase our understanding of the validity of the scores generated by different lexical diversity (LD) estimation techniques. Four techniques were explored: D, Maas, Measure of Textual Lexical Diversity (MTLD), and the Moving Average Type Token Ratio (MATTR).
Method—Four LD indices were estimated for language samples on four discourse tasks (procedures, eventcasts, story retell, and recounts) from 442 neurologically intact adults. The resulting data were analyzed using structural equation modeling.
Results—The scores on the …