In making Venn diagrams to look at overlap of sets, I often wonder how significant a given amount of overlap is. What is the likelyhodd of getting a certain amount of overlap from two sets, simply by chance?

One way to assess this, is to use the hypergeometric distribution. 

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

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