Agilent Technologies J3972A User's Guide Page 48

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Reporter
Introduction
5967–9446 47
Baselines
Reporter’s Network Health, Response Profile, and Component Health
graphs include a baseline feature. Baselines are useful in determining
what is normal for your network which, in turn, helps you identify
abnormal events. This information is helpful, for example, when setting
alarm thresholds.
Reporter depicts the baseline as a colored area behind the line graph,
which shows the actual data values for the selected statistic. The base-
line area represents the envelope between low and high baseline values,
which are based on data from the previous sixteen weeks.
The actual data values (which are not part of the baseline calculation)
are superimposed on the baseline envelope, allowing for easy
comparison.
A sample Network Health graph with baseline is shown on page 88.
To determine the baseline, Reporter compares a given data point to
similar 30-minute data points for the past sixteen weeks (if available),
calculates the standard deviation using the requested confidence level,
and graphs an envelope about that point.
A “similar” data point is one that represents the same period of the day
on the same weekday. The period used depends on the duration shown in
the graph:
For reports showing one day or less, one-hour periods are used. For
example, Reporter combines the data for 8:00 am to 9:00 am Monday
morning and compares it with the data from previous Mondays
between 8:00 am and 9:00 am.
For reports showing more than one day and less than one month, eight-
hour periods are used. For example, Reporter combines the data for
8:00 am to 4:00 pm Wednesday and compares it with the data from
previous Wednesdays between those hours.
For reports showing more than one month, one-day periods are used.
For example, Reporter combines the data for all of Friday and compares
it with the data from previous Fridays.
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