Abstract

Stansfield and Carlton [Human Biology 79:255–260 (2007)] reported that the distributions of the combinations of the sexes in human sibships are binomial. They inferred that the probabilities of male births are equal and independent within and across all sibships. Here I argue that their argument is both invalid and false. Contrary to their inference, a binomial distribution may result when equal and counterbalancing measures of Poisson and Lexis variation are simultaneously present. These conditions are approximately met with respect to human births.

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Additional Information

ISSN
1534-6617
Print ISSN
0018-7143
Pages
pp. 13-22
Launched on MUSE
2009-07-18
Open Access
No
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