![]() ![]() To determine whether the General Ability Index (GAI) may be used to summarize overall intellectual ability, calculate the difference between the VCI and PRI. Highest Lowest Difference Is the difference < 23 points? Index Standard Scores: – = Y or N Step 2b. To determine whether the FSIQ is interpretable, subtract the Lowest Index from the Highest Index. Determine the Best Way to Summarize Overall Intellectual Ability. (See Rapid Reference 5.2 for descriptive categories.) STEP 2. For subtests, report scaled scores and percentile ranks only. For IQ and indexes, report standard score, confidence interval, percentile rank, and descriptive category. Report the Person’s WAIS-IV Standard Scores (FSIQ and Indexes) and Subtest Scaled Scores. Appendix A A.1: WAIS ‐ IV Interpretive Worksheet 1 STEP 1.
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