An updated version of the historical Arbuthnot dataset. Numbers of boys and girls born in the United States between 1940 and 2002.
A data frame with 63 observations on the following 3 variables.
Number of boys born.
Number of girls born.
Mathews, T. J., and Brady E. Hamilton. "Trend analysis of the sex ratio at birth in the United States." National vital statistics reports 53.20 (2005): 1-17.