Reconsidering the Psychometrics of the GRS-S: Evidence for Parsimony in Measurement

Autor/inn/en	Petscher, Yaacov; Pfeiffer, Steven I.
Titel	Reconsidering the Psychometrics of the GRS-S: Evidence for Parsimony in Measurement
Quelle	In: Assessment for Effective Intervention, 46 (2020) 1, S.55-66 (12 Seiten) PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Petscher, Yaacov)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1534-5084
DOI	10.1177/1534508418824743
Schlagwörter	Psychometrics; Academically Gifted; Rating Scales; Factor Structure; Factor Analysis; Item Response Theory; Test Reliability; Accuracy; Cutting Scores; Children; Intelligence Tests; Achievement Tests; Screening Tests; Item Analysis; Scaling; Wechsler Intelligence Scale for Children; Wechsler Individual Achievement Test + Suchen Sie Ihr Suchwort? Psychometry; Psychometrie; Rating-Skala; Faktorenstruktur; Faktorenanalyse; Item-Response-Theorie; Testreliabilität; Child; Kind; Kinder; Intelligence test; Intelligenztest; Achievement test; Achievement; Testing; Test; Tests; Leistungsbeurteilung; Leistungsüberprüfung; Leistung; Testdurchführung; Testen; Screening-Verfahren; Itemanalyse; Scale construction; Skalenkonstruktion; WIAT; Eignungsprüfung; Eignungstest
Abstract	The authors evaluated measurement-level, factor-level, item-level, and scale-level revisions to the "Gifted Rating Scales-School Form" (GRS-S). Measurement-level considerations tested the extent to which treating the Likert-type scale rating as categorical or continuous produced different fit across unidimensional, correlated trait, and bifactor latent factor structures. Item- and scale-level analyses demonstrated that the GRS-S could be reduced from a 72-item assessment on a 9-point rating scale down to a 30-item assessment on a 3-point rating scale. Reliability from the reduced assessment was high ([omega] > 0.95). Receiver operating characteristic (ROC) curve comparisons between the original and reduced versions of the GRS-S showed that diagnostic accuracy (i.e., area under the curve) of the scales was comparable when considering cut scores of 120, 125, and 130 on the "WISC-IV Full Scale" ("Wechsler Intelligence Scale for Child--Fourth Edition") and verbal IQ and the WIAT-III (Wechsler Individual Achievement Test--Third Edition) composite score. The findings suggest that a brief form of the GRS-S can be used as a universal or selective screener for giftedness without sacrificing key psychometric considerations. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01