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Therefore, neither FSIQ or GAI is interpretable suggesting global ability cannot be meaningfully conveyed as a single score. NO: variation in indexes that comprise GAI is considered too great for the purpose of summarising global ability in a single score (GAI).To calculate GAI, sum scaled scores from the six subtests and refer to Appendix C of the WAIS-IV-Technical and Interpretive Manual. YES: Then the GAI may be calculated and interpreted as a reliable and valid measure of general intellectual ability.Is the size of the standard score difference between VCI and PRI less than 1.5 SD (i.e., 23 points)? When the FSIQ is not interpretable, determine whether the GAI may be used to describe overall intellectual ability. NO: Variation in indexes comprising the FSIQ is too great, for the purpose of summarising global intellectual ability as a single score (FSIQ).YES: FSIQ may be interpreted as reliable and valid estimate of intellectual ability.Is the size of this difference less than 1.5 standard deviation (SD) (i.e., 23 points)? This is the complete process for determining whether or not to include GAI in a psychological report:ġa. For all other Wechsler tests, the GAI will not be accepted. 1½ or more standard deviations) between two index scores. For the WISC-IV only: American Mensa will accept the general abilities index (GAI) in cases where there is a significant difference (i.e. This is the note for American Mensa's exception regarding using GAI with the WISC-IV:
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Everyone who takes a full WISC or WAIS evaluation has a calculable GAI even though it is only referenced when there is a 1.5sd+ difference between two index scores AND there is less than 1.5 sd difference between the perceptual reasoning and verbal comprehension index scores. My question is as to whether or not Mensa will calculate GAI even though it was not mentioned in the report. In fact 5/6 index score differences (all except PRI-WMI) were 1.5sd+. My largest difference is between processing speed and verbal comprehension (71 points), but that is just one of the index score differences that are 1.5sd+. GAI was not considered in the report because there was a significant difference (27 points) between my verbal comprehension (146) and perceptual reasoning (119) index scores. The scaled scores for Vocabulary, Comprehension, Similarities, Block Design, Matrix Reasoning, and Picture Concepts used to calculate GAI added up to 92.Īccording to the table in this link ( WISC-IV Technical Report #4: General Ability Index ()) a sum of 92 corresponds to a GAI of 139 which is the 99.5th percentile. I recently looked at a WISC-IV assessment I was administered at age 12 and calculated GAI from relevant scaled scores. I am aware that American Mensa will accept GAI for the WISC-IV in case of significant (1.5sd+) difference between two index scores.