"Twentieth Century Intercohort Trends in Verbal Ability in the United States" https://www.sociologicalscience.com/download/vol-3/june/SocSci_v3_383to412.pdf …
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Yup, was surprised when I first in read it in something Ronald Hoeflin wrote years ago.
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He made the interesting assertion that cleverly devised verbal test could circumvent attempts to cram vocab.
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