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Well, there you are: a nice explanation of HyperLogLog, along with graphs, and a javascript demo to play with. And a tribute to Philippe Flajolet who came up with the algorithm.

http://blog.aggregateknowledge.com/2012/10/25/sketch-of-the-...

The Aggregate Knowledge blog is mind blowing for everything sketch related.

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Is that demo widget custom, or did they use a tool to generate it? Do you know?

According to this comment http://blog.aggregateknowledge.com/2012/10/25/sketch-of-the-... , it's custom made and based on d3.

It would make the world a lot better if somebody made it easy to create that widget in IPython Notebook or some similar tool.

#IShouldDoThatButIProbablyWont

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