✦ LIBER ✦

Burt's twins: A question of numbers

✍ Scribed by David Burbridge

Publisher: John Wiley and Sons
Year: 2006
Tongue: English
Weight: 140 KB
Volume: 42
Category: Article
ISSN: 0022-5061
DOI: 10.1002/jhbs.20190

No coin nor oath required. For personal study only.

✦ Synopsis

This article estimates the number of monozygotic twins raised apart (MZA) potentially available to Cyril Burt in his twin studies. It concludes that between 77,000 and 88,000 monozygotic (MZ) twin pairs would have been born and survived to the age of ten in the relevant period in England and Wales, and that between 750 and 1,750 surviving pairs are likely to have been separated during childhood. Burt's claim to have collected 53 MZA pairs is therefore not inherently implausible. However, when all the other constraints on Burt's studies are taken into account, his numbers are problematic. There are also serious difficulties with his claim to have studied 12 pairs born to middle-class parents. It is highly improbable that Burt could have located a majority of these cases through personal contacts as he claimed.

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