Department of Educational Psychology, Baylor University, Waco, TX 76798-7301, USA.
Psychol Assess. 2013 Jun;25(2):477-83. doi: 10.1037/a0031653. Epub 2013 Feb 11.
Long-term stability of the Wechsler Intelligence Scale for Children-Fourth Edition (WISC-IV; Wechsler, 2003) was investigated with a sample of 344 students from 2 school districts twice evaluated for special education eligibility at an average interval of 2.84 years. Test-retest reliability coefficients for the Verbal Comprehension Index (VCI), Perceptual Reasoning Index (PRI), Working Memory Index (WMI), Processing Speed Index (PSI), and the Full Scale IQ (FSIQ) were .72, .76, .66, .65, and .82, respectively. As predicted, the test-retest reliability coefficients for the subtests (Mdn = .56) were generally lower than the index scores (Mdn = .69) and the FSIQ (.82). On average, subtest scores did not differ by more than 1 point, and index scores did not differ by more than 2 points across the test-retest interval. However, 25% of the students earned FSIQ scores that differed by 10 or more points, and 29%, 39%, 37%, and 44% of the students earned VCI, PRI, WMI, and PSI scores, respectively, that varied by 10 or more points. Given this variability, it cannot be assumed that WISC-IV scores will be consistent across long test-retest intervals for individual students.
对威克斯勒儿童智力量表第四版（WISC-IV；Wechsler，2003）的长期稳定性进行了研究，样本包括来自 2 个学区的 344 名学生，他们在平均 2.84 年的时间内两次接受特殊教育资格评估。言语理解指数（VCI）、知觉推理指数（PRI）、工作记忆指数（WMI）、处理速度指数（PSI）和全量表智商（FSIQ）的重测信度系数分别为.72、.76、.66、.65 和.82。正如预测的那样，测验的重测信度系数（Mdn =.56）通常低于指标分数（Mdn =.69）和 FSIQ（.82）。平均而言，子测验的分数差异不超过 1 分，而指数分数在重测间隔内差异不超过 2 分。然而，25%的学生的 FSIQ 得分相差 10 分或更多，29%、39%、37%和 44%的学生分别获得 VCI、PRI、WMI 和 PSI 分数相差 10 分或更多。考虑到这种变异性，不能假设 WISC-IV 分数在个体学生的长测试-重测间隔内会保持一致。
