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Answering the next three questions will help you select the appropriate model. Step 4 is designed to help you determine if use of the Keith Five-Factor model is appropriate or if the Wechsler Four-Index model should be your choice for interpretation. Select the Wechsler Four-Index Model or the Keith Five-Factor Model. Is the difference significant? 9 points Y or N Is the difference uncommon? 19 points Y or N If it is 19 points or more, it should be considered uncommonly large (occurring less than 10% of the time in the standardization sample).
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Determine whether the size of the difference between the GAI and CPI is uncommonly large. If it is 9 points or more, it should be considered statistically different (at the p <. Record the size of the difference between the GAI and CPI in the table below. To calculate the CPI, sum 4 subtest scaled scores of the 2 Core WMI subtests and 2 Core PSI subtests and locate the CPI that corresponds to this sum in Appendix A.2 the CD-ROM.Ī.1:WAISIVInterpretiveWorksheetSum of Subtest Scaled Scores = To calculate the GAI, sum 6 subtest scaled scores of the 3 VCI subtests and 3 PRI subtests and locate the GAI that corresponds to this sum in Table C.1 of the WAIS-IV Technical and Interpretive Manual (Psychological Corporation, 2008, p. Otherwise use the tables below to calculate the GAI and CPI. If the GAI has been calculated in Step 2b, use the value for Step 3c. If YES, then the CPI can be calculated and interpreted as a reliable and valid estimate of the persons overall ability for proficient information processing, through quick visual speed and good mental control.Ĭalculate the GAI and CPI if they represent unitary abilities or processes. Is the difference < 23 points? Y or N If NO, the GAI-CPI comparison cannot be made. Go to Step 4.ĭetermine whether the CPI represents a unitary ability by calculating the difference between the WMI and the PSI. If NO, the GAI-CPI comparison cannot be made. Proceed to the next part of this step to determine whether the CPI can be interpreted. If YES, the GAI can be calculated and interpreted as a reliable and valid estimate of the persons overall intellectual ability. If you completed this calculation in Step 2b, then transfer those results here. If you have not already done so in Step 2b, determine whether the GAI represents a unitary ability by calculating the difference between the VCI and PRI. Determine whether the GAI and CPI represent unitary abilities or processes. Sum of Subtest Scaled Scores =ĭetermine Whether the Difference between the Persons GAI and Cognitive Proficiency Index (CPI) Is Unusually Large. To calculate the GAI, sum 6 subtest scaled scores of the 3 VCI subtests and 3 PRI subtests, and locate the GAI that corresponds to this sum in Table C.1 of the WAIS-IV Technical and Interpretive Manual (Psychological Corporation, 2008, p. To determine whether the General Ability Index (GAI) may be used to summarize overall intellectual ability, calculate the difference between the VCI and PRI. If YES, the FSIQ may be interpreted as a reliable and valid estimate of a persons overall intellectual ability. 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. Report the Persons WAIS-IV Standard Scores (FSIQ and Indexes) and Subtest Scaled Scores.įor IQ and indexes, report standard score, confidence interval, percentile rank, and descriptive category.
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WAIS-IV UK Administration and Scoring Manual WAIS-IV UK Symbol Search Scoring Key WAIS-IV UK Stimulus Book 1.These resources will be available to you free of charge. The authors of the test manual generally stated that there are changes in the content, administration, scoring, and standardization. The EIWA test manual also provides little information about the two tests' comparability. Not being interchangeable with the WAIS however, the specific differences between the two tests are not noted. The editors and chapter authors have exclusive access to proprietary WAIS-IV data to run advanced analyses and provide information beyond what is offered in the WAIS-IV manual.
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