#acl ChrisSeidel:read,write,delete,revert All:read
In making Venn diagrams to look at overlap of sets, I often wonder how significant a given amount of overlap is. What is the likelyhood of seeing a given amount of overlap from two sets, simply by chance?

One way to assess this, is to use the hypergeometric distribution. The R language has a nice function for calculating the p-value, but the explanation of how to use it involves an Urn of black and white balls.
{{{
phyper()
}}}

== Making Venn Diagrams ==
* I wrote a utility for making venn diagrams: [http://www.pangloss.com/seidel/Protocols/venn.cgi venn diagrams]

* But someone else wrote a better one recently: [http:// venny]