ERIC Number: EJ894136
Record Type: Journal
Publication Date: 2010-Sep
Abstractor: As Provided
Reference Count: 47
Constructs Assessed by the GARS-2: Factor Analysis of Data from the Standardization Sample
Pandolfi, Vincent; Magyar, Caroline I.; Dill, Charles A.
Journal of Autism and Developmental Disorders, v40 n9 p1118-1130 Sep 2010
The GARS-2 (Gilliam 2006) is widely used for autism screening; however, the validity of its three conceptually-derived subscales has not been evaluated. In this study, exploratory (EFA) and confirmatory (CFA) factor analyses of data from matched subgroups of the standardization sample did not support the GARS-2 subscale structure. EFAs identified four factors in the model development subgroup (n = 496): "stereotyped/repetitive behavior," "stereotyped/idiosyncratic language," "word use problems," and "social impairment." CFAs supported this model in the replication subgroup (n = 494). Findings suggest that the GARS-2 subscales have limited clinical utility and that the Autism Index should be interpreted with caution. Although more research is needed, the clinical utility of the four empirically-derived scales may be limited by factors related to item content and test development procedures.
Descriptors: Autism, Factor Analysis, Test Construction, Rating Scales, Test Validity, Evaluation Research, Antisocial Behavior, Language Usage, Vocabulary, Interpersonal Competence, Screening Tests
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
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