#  xkcd on Correlation and Causation 

 





March 06, 2009

 

 

[](http://xkcd.com/552/)

Posted by [Andy Eggers](http://www.iq.harvard.edu/blog/sss/archives/author/andy-eggers/) at March 6, 2009 1:09 PM



 

 

 



 

 

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