Psychometric Evaluation of Lexical Diversity Indices: Assessing Length Effects

Journal of Speech, Language, and Hearing Research : JSLHR
Gerasimos FergadiotisSamuel B Green

Abstract

Several novel techniques have been developed recently to assess the breadth of a 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, and moving-average type-token ratio. Four LD indices were estimated for language samples on 4 discourse tasks (procedures, eventcasts, story retell, and recounts) from 442 adults who are neurologically intact. The resulting data were analyzed using structural equation modeling. The scores for measure of textual lexical diversity and moving-average type-token ratio were stronger indicators of the LD of the language samples. The results for the other 2 techniques were consistent with the presence of method factors representing construct-irrelevant sources. These findings offer a deeper understanding of the relative validity of the 4 estimation techniques and should assist clinicians and researchers in the selection of LD measures of language samples that minimize construct-irrelevant sources.

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Citations

Dec 15, 2015·Neuropsychology, Development, and Cognition. Section B, Aging, Neuropsychology and Cognition·Gilson J CapiloutoKatherine McComas Maddy
Dec 23, 2015·CoDAS·Adriana de Souza Batista KidaSimone Aparecida Capellini
Mar 3, 2018·American Journal of Speech-language Pathology·Lisa D BunkerJulie L Wambaugh
Mar 20, 2020·Journal of Speech, Language, and Hearing Research : JSLHR·Kevin T Cunningham, Katarina L Haley
Apr 6, 2019·Journal of Speech, Language, and Hearing Research : JSLHR·Maria KapantzoglouAlejandra Auza Buenavides
Jul 22, 2020·American Journal of Speech-language Pathology·Monique CharestPhyllis Schneider
Nov 7, 2019·American Journal of Speech-language Pathology·Hana Kim, Heather Harris Wright
Aug 9, 2020·International Journal of Language & Communication Disorders·Barnali MazumdarAsifa Sultana
Feb 15, 2020·Journal of Fluency Disorders·Courtney LuckmanNan Bernstein Ratner
May 28, 2021·Journal of Communication Disorders·Lindsey Hiebert, Raúl Rojas
Nov 24, 2021·Scandinavian Journal of Psychology·Ido ZivNachum Dershowitz

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