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Are there any resources out there to estimate the distribution of actual birth dates vs due dates? I would like to do a analysis similar to this.

Thanks on advance.

  • I'm not sure where this data came from, and it's not exactly what you're looking for, but perhaps it will give you some additional sources to consider: Birthday patterns in the US. – dimo414 Sep 26 '14 at 4:15
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Allen Downey's free online book Think Stats uses data from the National Survey of Family Growth to consider the question "Do First Babies Arrive Late?"

Section 1.3 of the book explains some use of the data. There is a newer version of the dataset (2006-2010) on the NSFG site.

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