Confirmatory factor analysis of the Wechsler Memory Scale-III

The latent structure of the Wechsler Memory Scale-III was analyzed by confi rmatory factor analysis using the covariance matrix based on the 11 primary subtests from the standardization sample. Omnibus fit indexes and individu al parameter estimates were examined. Of the five models evaluated, a three -factor model (working memory, auditory memory, and visual memory) provided the best fit for the standardization sample (NNFI = .98, RMSEA = .05, GFI = .98, BIC = 429.42). Models that proposed separate immediate and delayed m emory constructs were hampered by inadmissible parameter estimates that sig naled model specification errors. R-2 values for the Faces subtests were un iformly low for all five models that suggested that this subtest has insuff icient commonality with the visual memory construct.