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Overview

Number of male and female births, sex ratio at birth, and number of excess males: United States, 1940–2002.

Variables

• year: A numeric vector, 1940-2002.
• boys: A numeric vector, number of male births.
• girls: A numeric vector, number of female births.

Data Source

Mathews TJ, and Hamilton BE. 2005. Trend analysis of the sex ratio at birth in the United States. National Vital Statistics Reports 53(20):1-17.

Loading Data

CSV Download

To access the data in R, type

source("http://www.openintro.org/books/statdata/present.R")

To access the data in SAS, type

filename present url 'http://www.openintro.org/books/statdata/present.csv'