A study of the variability of IQ's in retest

Abstract

"The data on 3000 children—of whom 1000 had two tests, 1000 three tests, and 1000 four tests—show that the IQ range, the chronological age at first test, and the interval elapsing between first and last tests, may be eliminated as causes for variation in IQ on retest." (PsycInfo Database Record (c) 2025 APA, all rights reserved)