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README.md update README files Feb 9, 2018
US_births_1994-2003_CDC_NCHS.csv add births data May 31, 2016
US_births_2000-2014_SSA.csv add births data May 31, 2016

README.md

U.S. Births

This folder contains data behind the story Some People Are Too Superstitious To Have A Baby On Friday The 13th.

There are two files:

US_births_1994-2003_CDC_NCHS.csv contains U.S. births data for the years 1994 to 2003, as provided by the Centers for Disease Control and Prevention's National Center for Health Statistics.

US_births_2000-2014_SSA.csv contains U.S. births data for the years 2000 to 2014, as provided by the Social Security Administration.

Both files have the following structure:

Header Definition
year Year
month Month
date_of_month Day number of the month
day_of_week Day of week, where 1 is Monday and 7 is Sunday
births Number of births