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document I administered the WISC–IV to a student who scored 65 on each of the VCI, PRI, WMI, and PSI indexes, but his FSIQ was 57. Shouldn’t it be 65? Also known as Regression to the Mean.
Many people find this result counterintuitive, but it is correct. First, consider that the FSIQ is used to predict the student’s true intelligence and does not correlate perfectly with it. Then consider that the index scores are composed of fewer subtests than the full scale IQ score and do not correlate perfectly with the FSIQ. In this case, if the...
19 Apr, 2010 Views: 24629