![]() Variances-covariances matrices were used as input data. Reliabilities (Split-half method) are shown in Table 1.Īnalyses were performed through the Amos 3.6 statistical package (Arbuckle, 1997). Three IQ scores (Total IQ, Verbal IQ, Performance IQ), and four cognitive indexes (Verbal Comprehension, Perceptual Organisation, Working Memory, and Processing Speed) are computed after the WAIS-III subtests (see TEA, 1999 for details). The WAIS-III is an individually administered cognitive scale, shaped by 14 subtests: Vocabulary, Similarities, Information, Comprehension, Arithmetic, Digit span, Letter-number series, Picture completion, Block design, Matrices, Picture arrangement, Object assembly, Coding, and Symbol search. So, the standardisation sample is representative of the Spanish population. No larger differences than 3% were found between the standardisation sample, and the Spanish census in the percentages of sex, age, residence (urban, intermediate, rural), educational level, and geographic location (Seisdedos & Corral, 1999). The Spanish standardisation sample of the WAIS-III (N= 1369 TEA, 1999)) was analysed in the present study. Confirmatory factor analysis will be conducted in order to compare different hypothesised models on the grounds of well-known fit indexes (Bollen, 1989). The aim of the current study is to look into the factor structure of the Spanish version of the WAIS-III. They conclude that the one and two-factor solutions are both plausible, whereas the third factor is not replicable across age groups and, therefore, it is a questionable factor. Caruso and Cliff (1998) suggest that divergences on how many factors should be extracted, as well as methodological pitfalls, are responsible of such conflictive results. In fact, it has been claimed that they should become extinct (Carroll, 1993 Frank, 1983).įocusing on WAIS scales (WAIS, WAIS-R, and WAIS-III), different structures with one (O’Grady, 1983), two (Verbal and Performance factors Wechsler, 1955 Siegert, Pattern, Taylor, & McCormick, 1988), or three factors (Verbal Comprehension, Perceptual Organisation, and Freedom from Distractibility Allen and Thorndike, 1995 Silverstein, 1985) have been defended. Nevertheless, they have been continuously criticised due to the instability of the extracted factors, and the lack of agreement regarding their number and nature (Caruso & Cliff, 1998 Geary, & Whitworth, 1988 Kamphaus, Benson, Hutchison, & Platt, 1994 O’Grady, 1989 O’Grady, 1990). Wechsler’s scales (WPPSI, WISC, WAIS and their successive versions) are probably the psychometric instruments most used to assess cognitive abilities. Se discuten las implicaciones sobre las puntuaciones obtenidasĪ partir de la escala (CI total, CI verbal, CI manipulativo así ![]() Los índices de ajuste presentaban valores considerados aceptables.Įn general, los resultados avalan la conclusión de que gĮs la principal aptitud cognitiva evaluada por la versión españolaĭel WAIS-III. Un factor de segundo orden (identificado con g) al modelo anterior, Perceptiva, Memoria de trabajo y Velocidad de procesamiento) obtuvoĮl mejor ajuste en todas las muestras. El modelo con cuatro factores de primer orden (Verbal, Organización Con este objetivo diversos modelos estructurales fueronĪjustados tanto en la muestra total (N = 1369) como en cada grupo deĮdad. Previas, es necesario comprobar qué factores está evaluando TeniendoĮn cuenta la polémica sobre la estructura factorial de las versiones (WAIS-III), se adaptó dicha escala en España. de la tercera versión de la escala Wechsler para adultos Tan solo dos años después de la publicaciónĮn EE.UU. IQ, and four cognitive indexes) are discussed.Įstructura factorial de la versión españolaĭel WAIS-III. Implicationsįor the scores computed after the scale (Total IQ, Verbal IQ, Performance Would be the main cognitive ability assessed by the WAIS-III. The fit indexes also show acceptable values. When a second-orderįactor (identified with the g factor) is added to this model, A model withįour first-order factors (Verbal, Perceptual Organisation, Working MemoryĪnd Processing Speed) presents the best fit in all samples. Models were analysed in the total sample (N = 1369), and in every normativeĪge group through confirmatory factor analysis procedures. It is critical to test what this new scale is assessing. Taking into account the polemicĪbout the factor structure of the previous versions (WAIS, and WAIS-R), The Spanish version of the WAIS-III scale was published García, Miguel Ángel Ruiz and Francisco José Abad
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