present: Male and female births in the US

Description Usage Format Source

Description

Counts of the total number of male and female births in the United States from 1940 to 2013.

Usage

1

Format

A tbl_df with 74 rows and 3 variables:

year

year, ranging from 1940 to 2013

boys

number of male births

girls

number of female births

Source

Data up to 2002 appear in 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. Data for 2003 - 2013 have been collected from annual National Vital Statistics Reports published by the US Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics.


OpenIntroOrg/oilabs-r-package documentation built on May 30, 2018, 9:21 p.m.