This replicates the finding of Lewis Terman's longitudinal study of high-IQ elementary-age pupils that many of those young people did not qualify as "gifted" on a subsequent test that Terman gave them at high school age. But he kept them in the study group anyway.
Shurkin, Joel N. (1992). Terman's Kids: The Groundbreaking Study of How the Gifted Grow Up. Boston: Little, Brown.
An especially odd result of the Terman study is that Terman tested and rejected for inclusion in his study two children whose IQ scores were below his cut-off line who later went on to win Nobel prizes: William Shockley, who co-invented the transistor, and physicist Luis Alvarez. None of the children included in the study ever won a Nobel prize.
The last bit is in Shurkin's book, and also in a book by Eysenck, with the primary source in both cases cited as personal recollections of the two Nobel Prize winners.
I think it is independently historically verifiable that both Alvarez and Shockley attended schools where Terman did testing for ascertainment for his longitudinal study. It is definitely historically verifiable that neither Nobel prize winner was included in the study--Shurkin had full access to the study data files.
Shurkin, Joel N. (1992). Terman's Kids: The Groundbreaking Study of How the Gifted Grow Up. Boston: Little, Brown.
An especially odd result of the Terman study is that Terman tested and rejected for inclusion in his study two children whose IQ scores were below his cut-off line who later went on to win Nobel prizes: William Shockley, who co-invented the transistor, and physicist Luis Alvarez. None of the children included in the study ever won a Nobel prize.