The performance of the three models indicated by the adjusted Rand index obtained from the synthetic data sets using hierarchical clustering and k-means clustering. The number of the replicates varies from 2 to 20. Each correlation is represented by a curve: SCC (red), SD-weighted correlation (green), and Pearson correlation (blue). Every data point on a curve is an average adjusted Rand index over 1000 trials of generating and clustering the synthetic data. Hierarchical clustering: (a) Low noise level. (b) High noise level. K-means clustering: (c) Low noise level. (d) High noise level. Error bars are not shown here because, given the scaling of the Figure, they are too small to be graphically depicted after 1000 trials.