Table 2.
Adjusted Rand index (ARI) results for Simulation I
| RV | ICEM | KM | AHC | SS | |
|---|---|---|---|---|---|
| Overall | .47 | .47 | .46 | .46 | .44 |
| Clusters | |||||
| 2 | .43 | .43 | .42 | .43 | .42 |
| 4 | .52 | .51 | .51 | .50 | .49 |
| 6 | .45 | .45 | .45 | .44 | .41 |
| Variables | |||||
| 2 | .52 | .52 | .52 | .53 | .51 |
| 4 | .42 | .42 | .43 | .40 | .40 |
| 6 | .45 | .45 | .43 | .44 | .41 |
| SS | |||||
| 100 | .39 | .39 | .39 | .39 | .37 |
| 500 | .48 | .48 | .47 | .47 | .45 |
| 800 | .53 | .53 | .52 | .51 | .50 |
| Density | |||||
| Equal-sized | .44 | .42 | .44 | .44 | .43 |
| 1 Small | .46 | .47 | .46 | .47 | .45 |
| 1 Large | .50 | .50 | .48 | .46 | .43 |
| Separation | |||||
| Close | .26 | .26 | .25 | .26 | .24 |
| Moderate | .53 | .54 | .53 | .52 | .51 |
| Well | .60 | .60 | .60 | .59 | .56 |
Each cell is the average ARI of the classifications of the resulting solution and the true generated cluster structure. Bold values indicate the best ARI for the factor condition. RV, random values; ICEM, iteratively constrained EM; KM, k-means clustering; AHC, agglomerative hierarchical clustering; SS, sum score.