Cluster Centroids Report - Batch Job Class
The Cluster Centroids Report provides a summary of the patterns that are identified by the clustering procedure. A sample Cluster Centroids Report is shown in Figure 11-26. This report allows you to determine the characteristics of the patterns that are identified.
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The Cluster Centroids Report provides a summary of the patterns that are identified by the clustering procedure. A sample Cluster Centroids Report is shown in Figure 11-26. This report allows you to determine the characteristics of the patterns that are identified.
Figure 11-26. Cluster Centroids Report
CLUSTER CENTROIDS CLUSTER JOBMXNTA JOBTCBTM JOBNLR RADIUS NO ASSIGN PCT ------- -------- -------- -------- ------ --------- --- 1 0.0 0:00:05 3450.7 2.00 145 7 2 1.0 0:00:03 277.8 1.00 163 8 3 0.0 0:00:57 90.9 3.00 68 3 4 1.0 0:00:23 64.4 2.50 56 3 5 0.0 0:00:14 181.8 1.00 156 8 6 2.0 0:00:03 209.3 3.00 58 3 7 0.0 0:00:01 267.7 1.00 1172 59 8 0.0 0:00:07 8165.7 3.00 54 3 9 1.0 0:00:03 3950.7 2.50 20 1 10 0.0 0:00:11 12211.6 3.00 81 4 11 0.0 0:00:36 261.4 2.00 27 1
On the sample, consider the values shown for CLUSTER in the report. Cluster 7 represents approximately 59% of all jobs that executed during the seven-day period. The cluster centroid represents a job that uses no tape drives, uses one second of CPU time, and prints approximately 270 lines. The radius of the cluster is 1.0 standard deviations. Using the trimmed standard deviation values from the example in Figure 11-15 in Statistical Analysis Parameters Screen, we can determine the bounds of the jobs assigned to the cluster. Consider the following table for cluster 7:
LOWER UPPER FEATURE CENTROID STD DEV BOUND BOUND ======== ======== ======= ===== ===== JOBTCBTM 0:01 0:11 -0:10 +0:12 JOBMXNTA 0 0.39 -0.39 +0.39 JOBNLR 267 2339 -2072 +2606
By multiplying the positive and negative values of the cluster's radius times by the standard deviation for each of the features, you can determine the possible bounds of the cluster. You can allocate tapes only in integer values and that jobs cannot consume negative resource. The minimum value of CPU time observed in the distribution was .01 second. This simplification yields the following table:
LOWER UPPER FEATURE CENTROID STD DEV BOUND BOUND ======== ======== ======= ===== ===== JOBTCBTM 0:01 0:11 0:01 +0:12 JOBMXNTA 0 0.39 0 0 JOBNLR 267 2339 0 +2606
Although the second table still indicates that the resulting cluster has some positive variability, the closeness of the cluster's mean values to the minimum values (from the Descriptive Statistics Report, Figure 11-27 in Random Sample Cluster Assignment Report - Batch Job Class) for the distribution indicates that the number of extreme values is small.