Birth counts — present • openintro

An updated version of the historical Arbuthnot dataset. Numbers of boys and girls born in the United States between 1940 and 2002.

Usage

present

Format

A data frame with 63 observations on the following 3 variables.

year: Year.
boys: Number of boys born.
girls: Number of girls born.

Source

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.

Examples


library(ggplot2)

ggplot(present, mapping = aes(x = year, y = boys / girls)) +
  geom_line()