At this point in the series I wanted to know how the reader would score on tests that he did not select for himself but that I chose for him. I figured a good measure of overall IQ would consist of at least 3 major cognitive domains, so the domains I selected were Verbal, Visual, and Numerical. To assess these three domains, the tests I chose were Vocabulary from the ancient WBI, Mug of Pee’s Gestalt, and the PATMA. These tests were chosen because they’re all quick, highly g loaded and normed by me personally.
Vocabulary from the ancient WBI: Verbal IQ 138 (mild genius)
Long before the WAIS or WISC, there was the Wechsler–Bellevue Intelligence Scale. Originally Vocabulary was considered too culturally biased to be one of the core subtests, but was used as an alternate subtest. Wechsler randomly selected words from the dictionary that were then tried out on groups of people of known intelligence. Those words that best discriminated between the bright and dull were included in the final selection of 42 words that were used in the 1937 standardization.
When the reader was given rare access to this ancient list, he got full credit (1 point) for 34 of the 42 words and partial credit (0.5 points) for 2 of them, giving him a raw score of 35 out of 42. This equated to +1.66 SD among Wechsler’s 1937 sample of young adult White New Yorkers (selected to be representative of white Americans as a whole), however by the 21st century, many of the words on the list have become impossibly difficult, so using modern white norms, the reader’s score is +2.4 SD. But since the white population of the U.S./Canada has a slightly different IQ distribution from that of the overall U.S. population, it equates to +2.5 SD or IQ 138 (U.S. norms). This is remarkably consistent with a historiometric estimate of the reader’s vocabulary based on his kindergarten teacher’s subjective impression.
Mug of Pee’s Gestalt: Visual IQ 95 (average range)
Mug of Pee’s Gestalt was normed on a random sample of 15 white Ontarians. When the reader was asked to take this test his self-reported score was -0.66 SD below the norming sample’s mean. Unfortunately, education level for this sample was not obtained so it’s unclear if the Ontarians were representative of Canadians as a whole or Ontarians specifically. This is important because on achievement tests, Ontarians outperform the rest of Canada (at least in childhood), but it’s not clear if this difference would map to fluid IQ measures like Gestalt.
Assuming that on a scale where Americans have a mean of 100 and an SD of 15, the Ontarians, like Canadians on the whole score 103.9 (SD = 13.9) on perceptual reasoning tasks, the reader’s score would equate to an IQ of 95. This is perhaps not surprising because the reader’s psychometric history showed his lowest score on Paul Cooijmans’s spatial test and there’s no historiometric evidence of spatial precociousness.
The reader also self-reported a high score on Cooijmans’s aspergoid test. Although my amateur clinical impression just from reading a few of his emails is that the reader is not autistic, his relatively low Gestalt might suggest otherwise because one theory is autistics lack big picture thinking. More testing is needed to confirm or debunk this hypothesis.
The PATMA: Numerical IQ 131 (mild genius)
The PATMA is a quick test of lateral mathematical reasoning that appears to be exceptionally g loaded. The reader self-reports a score of 8 out of 10. Based on 11 (mostly self-reported) score pairs from people who have taken both the PATMA and (abbreviated) WAIS-III/WAIS-IV (roughly corrected for old norms) a score of 8 is now equating to an IQ of 131.
Overall global intellectual ability: Full-scale IQ 131 (mild genius)
It’s hard to calculate a composite score without knowing the intercorrelation of the above three tests, but a rough approach is as follows: The average score of the reader on these three tests is +1.42 SD (U.S. norms). If you average +1.42 SD on the 10 core WAIS-IV subtests, your full-scale IQ is 131. If we assume the above 3 tests are statistically equivalent to a random sample of WAIS-IV subtests, an overall IQ of 131 is implied.