Known/Unknown Number of Clusters

[lemonlaug]

As Donald Rumsfeld might have said we have only "known knowns" and we need to have "unknown knowns".

https://github.com/booz-allen-hamilton/The-Field-Guide-to-Data-Science/blob/master/TakingOffTheTrainingWheels/figures/mapguide-2.png

By that I mean: The bullet for clustering that includes X-means etc should read "If you have an unknown number of clusters."