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Background <p>The Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) is one of the leading instruments in general ability assessments; however, findings regarding its factor structure are still controversial.</p> Methods <p>In this study, the single-factor, correlated four-factor, higher-order factor, and bifactor models for the 10 basic tests of the WISC-IV were examined on systematically controlled samples with low (IQ ≤ 79; <i>N</i> = 141) and normal scores (IQ &gt; 80; <i>N</i> = 222).</p> Results <p>Our research findings revealed that only the bifactor and correlated four-factor models showed good fit in both sample groups; however, measurement invariance was provided only by the correlated four-factor model.</p> Conclusions <p>In general, our findings indicate that the use of the full-scale intelligence quotient (FSIQ) score should be used with caution in both low and normal IQ groups and that it would be more appropriate to prefer subscale index scores, especially in educational and clinical assessments.</p>

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Examining the psychometric properties of the WISC-IV in low and normal IQ samples

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月8日

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  • Samet Çelik,
  • Figen Eroğlu-Ada,
  • Esra Sözer Boz

摘要

Background

The Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV) is one of the leading instruments in general ability assessments; however, findings regarding its factor structure are still controversial.

Methods

In this study, the single-factor, correlated four-factor, higher-order factor, and bifactor models for the 10 basic tests of the WISC-IV were examined on systematically controlled samples with low (IQ ≤ 79; N = 141) and normal scores (IQ > 80; N = 222).

Results

Our research findings revealed that only the bifactor and correlated four-factor models showed good fit in both sample groups; however, measurement invariance was provided only by the correlated four-factor model.

Conclusions

In general, our findings indicate that the use of the full-scale intelligence quotient (FSIQ) score should be used with caution in both low and normal IQ groups and that it would be more appropriate to prefer subscale index scores, especially in educational and clinical assessments.