The Descriptive Statistics Report provides a summary of the descriptive statistics that are calculated for the cluster features. This report is used to evaluate the effects of trimming 2.5% (or the specified value) off the right-hand tails of the distributions on the sample averages and standard deviations. Figure 11-1 illustrates a sample Descriptive Statistics Report.
DESCRIPTIVE STATISTICS NUMBER OF OBSERVATIONS: 2000 ----------SAMPLE---------- ------TRIMMED 97.50%------ FEATURE MIN MAX AVERAGE STD DEV CV AVERAGE STD DEV CV -------- --------- --------- --------- --------- ---- --------- --------- ---- JOBMXNTA 0 6 0.2135 0.54687 2.6 0.154951 0.391913 2.5 JOBTCBTM 0.01 7115.71 16.6509 175.139 10.5 5.80658 11.0867 1.9 JOBNLR 0 334275 2327.42 12277.9 5.3 1019.77 2339.31 2.3
Figure 11-1. Descriptive Statistics Report
The Descriptive Statistics Report lists the following fields:
OBSERVATIONS: The number of observations used for the scaling
procedure. The default value is 2,000. The
value shown in this report differs from 2,000
in only two cases. The first case results when
the population you select from the CA MICS
database contains less than 2,000 observations.
The second case occurs when you override the
default value on the Workload Characterization
screen.
FEATURE: The feature name. The feature names that are
listed in the report correspond to the features
that are specified on the Workload
Characterization screen.
MIN: The minimum value observed for the feature in
the sample.
MAX: The maximum value observed for the feature in
the sample.
For the randomly selected SAMPLE, the following values are
calculated:
AVERAGE: The average calculated for the feature
observations in the sample.
STD DEV: The standard deviation calculated for the
feature observations in the sample.
CV: The coefficient of variation. The CV is
calculated by dividing the standard deviation
by the average.
For the trimmed SAMPLE, the percentage of the distribution
used for calculating the trimmed mean statistics is shown. In
Figure 11-1, 97.5% of the observations were included in the
calculation of the trimmed mean statistics.
AVERAGE: The mean calculated for the feature
observations in the trimmed sample.
STD DEV: The standard deviation calculated for the
feature observations in the trimmed sample.
CV: The coefficient of variation. The CV is
calculated by dividing the standard deviation
by the average.
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