DB-Index for Phi-Sample (large)

The Davies-Bouldin-Indexes for K-Means-Clustering of the Citation-Data of the top 2000 Papers from the 1990s. A low index indicates good clustering, which means that the clusters have high internal consistency and are very different to each other So we can say that the hypothesis of two clusters (eg. analytic and continental philosophy) seems not particulary merited (DB = 9.2), expecially when compared to 15 clusters, which yields a DB of 5.9.