Figure 1.

A Gap Curve. The Gap-Pc curve on the Leukemia dataset, with use of the Hier-S algorithm. At each point, error bars indicate the variation of the curve accross simulations. The curve shows a first maximum at k = 1, yielding a prediction of k* = 1, the next maximum is at k = 4, which is very close to the number of classes k* = 3.