Quotes About Psychometrics

a curious result kept turning up: If the same group of people took two different mental tests, anyone who did well (or poorly) on one test tended to do similarly well (or poorly) on the other. In statistical terms, the scores on the two tests were positively correlated.

By 1908, the concept of mental level (later called mental age) had been developed, followed in a few years by a slightly more sophisticated concept, the intelligence quotient.

It seems perverse to define intelligence as including rationality when no existing IQ test measures any such thing!

Because someone else will mention it to you anyway, I will list Stephen Jay Gould 's book ( The Mismeasure of Man ). It gets the psychometrics wrong, it is wrong on brain size and intelligence, and it is written with strong anti-IQ-testing bias.