Analysis of hierarchical communities.

<p>A single, randomly taken simulated data set is shown per case, with 100 records, 100 randomized null data sets and 500 bootstrap resamples per data set. The graphs (left) show the variance criterion for all possible numbers of clusters along with the lower 2.5 percentile for the corresponding null situation of no correlation between variables (simple lines). Grey circles mark correct clustering results for regular partitions. The diagrams to the right represent the different situations. The grayscale indicates the value of the correlation between variables (triangles) in the same ellipse. These were 0.273 and 0.545 in the eight variable cases (a–c), and 0.214, 0.429 and 0.643 in the 16 variable cases (d to f).