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Thursday, May 17, 2012

How Common Is Your Birthday? | The Daily Viz

How Common Is Your Birthday?

05/12/2012 by Matt Stiles

A friend posted an interesting data table on my Facebook wall yesterday, which was my birthday. The data listed each day of the year with a ranking for how many babies were born on each date from 1973 to 1999. Some interesting trends are evident in the data. Apparently, people like to make babies around the winter holiday season because a large proportion of babies are born in September (oursis due Sept. 24, btw).

Sept. 16 was most common. Feb. 29* was least common. This heatmap is an effort to visualize the trends, with darker shades representing more births:

Data source:, Amitabh Chandra, Harvard University

* A previous version of this post incorrectly listed Jan. 1 as the least common birth day.

See the article online here: How Common Is Your Birthday? | The Daily Viz


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