Construct Validity of the Indonesian WISC-V (WISC-V-ID): Evidence from the 10 Primary Subtests and Ancillary Index Analyses

The Wechsler Intelligence Scale for Children–Fifth Edition (WISC-V) has been adapted for the Indonesian population becoming the WISC-V-ID. The original test comprises 16 subtests, 10 of which are used to estimate five primary indexes: Verbal Comprehension (VC), Visual Spatial (VS), Fluid Reasoning (FR), Working Memory (WM), and Processing Speed (PS) as well as three ancillary indices: the General Ability Index (GAI), the Cognitive Proficiency Index (CPI), and the Non-Verbal Index (NVI). This study examined the construct validity of both the primary and ancillary indices of the WISC-V-ID using a series of confirmatory factor analyses. The participants included were 1,508 children aged 6–16 years, who were drawn from the Indonesian normative sample. The results indicated that both the hypothesized four- and five-factor higher-order models demonstrated an excellent global fit (CFI = .976–.998; TLI = .965–.996; RMSEA = .016–.047; SRMR = .011–.025), although the correlated five-factor model provided the best representation of the data (χ² = 35.228, df = 25, p = .084; CFI = .998; TLI = .996; RMSEA = .016; SRMR = .011). For the ancillary indices, a second-order oblique model best described the structure of GAI and CPI, which were strongly correlated. The NVI was optimally modeled by a higher-order configuration rather than a first-order model. These findings support the structural validity of the primary indexes WISC-V-ID and provide additional evidence regarding the factorial structure of ancillary indices, which have received limited empirical attention in the international literature.