Counts of the total number of male and female births in the United States from 1940 to 2013.
A tbl_df with 74 rows and 3 variables:
year, ranging from 1940 to 2013
number of male births
number of female births
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.
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