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Comparative Archaeology Database, University of Pittsburgh
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Wankarani Settlement Dataset |
The data file KMEANS.TXT provides the statistical results of the non-hierarchical K-means cluster analysis of Late Intermediate farmstead sites. Each line represents one cluster analysis solution. There are 9 lines, each with 13 variables separated by commas. The variables are, in the following order:
| 1 | The number of clusters requested for this solution |
| 2 | N: The number of sites (farmsteads) to be clustered |
| 3 | SSE (Summed Squared Error): The sum (over all 17 sites) of the squared Euclidean distances from each farmstead to the centroid of the cluster to which it is assigned |
| 4 | %SSE: The SSE as a percent of the maximum SSE |
| 5 | Log %SSE: Base 10 logarithm of the %SSE |
| 6 | The square root of (SSE/N), where N is the number of sites in the analysis (17) |
| 7 | nbar: The mean number of sites per cluster |
| 8 | nstd: The standard deviation of the number of sites per cluster |
| 9 | RMSbar: The mean RMS. RMS is the square root of the mean of the squared distances from each site in a cluster to the cluster centroid. |
| 10 | RMSstd: The standard deviation of the RMS |
| 11 | n>2: The number of clusters in the solution with more than two members |
| 12 | r2wbar: The mean r² value over all the clusters |
| 13 | r2wstd: The standard deviation of the r² value |
The first line of the file, for example, looks like this:
1,17,194.67,100,2,3.3839,17,0,3.38,0,1,0.13,0
This indicates that the solution is for 1 cluster, N is 17, SSE is 194.67, %SSE is 100, Log%SSE is 2, square root of SSE/N is 3.3839, nbar is 17, nstd is 0, RMSbar is 3.38, RMSstd is 0, n>2 is 1, r2wbar is 0.13, and r2wbarstd is 0.
The last (9th) line of the file is:
9,17,1.64,0.84,0,0.3102,1,1.9,0.19,0.18,2,0.39,0.44
This indicates that the solution is for 9 clusters, N is 17, SSE is 1.64, %SSE is 0.84, Log%SSE is 0, square root of SSE/N is 0.3102, nbar is 1, nstd is 1.9, RMSbar is 0.19, RMSstd is 0.18, n>2 is 2, r2wbar is 0.39, and r2wbarstd is 0.44.
Click here to download the file KMEANS.TXT (520 bytes).