http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Tue, 09 Jun 2026 12:18:54 GMT Tue, 09 Jun 2026 12:18:54 GMT The latest comments added to the Blog Entry, Birthday Post http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95805 <p>Alles Gute!</p> <p>If I go 9 month back than Xmas is indeed for Love &amp; Peace ...</p> The latest comments added to the Blog Entry, Birthday Post 95805 Thu, 05 Aug 2010 23:44:39 Z Axel Vogt Axel Vogt http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95807 <p><a href="http://www.mapleprimes.com/posts/95795-Birthday-Post#comment95805">@Axel Vogt</a> I tried to find birth data for Australia (to no avail) to see if that big bump is due to Christmas, or just to winter. :D&nbsp; If anyone can dig something up, I'd love to see it.</p> The latest comments added to the Blog Entry, Birthday Post 95807 Fri, 06 Aug 2010 00:52:24 Z John May John May http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95809 <p>Other than February 29, the day of the year with the fewest births (in typical Western countries) is December 25.&nbsp; Other holidays and Sundays also have few births.&nbsp; The reason is obvious, when you think of it: the obstetricians want the day off, so they don't schedule Caesarians for those days.&nbsp; See e.g. &lt;http://www.cdc.gov/nchs/data/statab/t001x16.pdf&gt;</p> The latest comments added to the Blog Entry, Birthday Post 95809 Fri, 06 Aug 2010 01:14:11 Z Robert Israel Robert Israel http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95811 <p><a href="http://www.mapleprimes.com/posts/95795-Birthday-Post#comment95809">@Robert Israel</a> There is a nice box plot of the weekend phenomena here <a href="http://www.stanford.edu/~dgleich/notebook/2009/04/birthday_distribution.html">http://www.stanford.edu/~dgleich/notebook/2009/04/birthday_distribution.html</a> too (using the US 1978 live birth data).&nbsp; I imagine that a lot of mothers do not want to give birth on Christmas either - that probably also contributes to the dip.</p> The latest comments added to the Blog Entry, Birthday Post 95811 Fri, 06 Aug 2010 01:29:50 Z John May John May http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95822 <p><a href="http://www.mapleprimes.com/posts/95795-Birthday-Post#comment95807">@John May</a>&nbsp; Look at <a href="http://www.abs.gov.au/AUSSTATS/abs@.nsf/DetailsPage/3301.02008?OpenDocument#Data">this</a> and read&nbsp; <a href="/view.aspx?sf=95822/279496/Biths_in_Australia_2.xls">Biths_in_Australia_2.xls</a>&nbsp; In my opinion the birthdays in Australia differ from the ones in the Northern Hemisphere, it is expected. PS. Sorry for the slip of the pen (of the click?) in the name of the linked file.</p> The latest comments added to the Blog Entry, Birthday Post 95822 Fri, 06 Aug 2010 10:59:08 Z hirnyk hirnyk http://www.mapleprimes.com/maplesoftblog/95795-Birthday-Post?ref=Feed:MaplePrimes:Birthday Post:Comments#comment95834 <p><a href="http://www.mapleprimes.com/posts/95795-Birthday-Post#comment95822">@hirnyk</a> I was hoping for daily birth data from Australia, but I used the monthly data you posted to plot Austrailian births from 1998-2007 (2008 Decemeber numbers looked incomplete) renormalized, fit with a curve (using <a href="http://www.maplesoft.com/support/help/search.aspx?term=CurveFitting,Spline">?CurveFitting,Spline</a> ), and overlaid on the US data:</p> <p><a href="/view.aspx?sf=95834/279521/Aus_vs_US-Births.png"><img src="/view.aspx?sf=95834/279521/Aus_vs_US-Births.png" alt=""></a></p> <p>To my eye it looks a little less seasonal perhaps due to seperate winter and Christmas/New Year conception spikes? (the white month labels at the bottom are the approximate months of conception)</p> <p>Heres the new worksheet: <a href="/view.aspx?sf=95834/279521/birthday-distributi.mw">birthday-distributi.mw</a></p> The latest comments added to the Blog Entry, Birthday Post 95834 Fri, 06 Aug 2010 18:12:32 Z John May John May