Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 271)

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 The sync time must be a valid FactoryTalk Historian Time.
Your new data set appears in the Data Sets dialog box.
Intervals and Time Value
The calculated value for each interval is plotted at the start of the interval.
For example, if the tag "t_min" has the following time-value pairs in a 10
minute interval, then the calculated value for this interval would be plotted
at time 1:00:00.
1:00:00 1
1:01:00 2
1:02:00 3
1:03:00 4
1:04:00 5
1:05:00 6
1:06:00 7
1:07:00 8
1:08:00 9
1:09:00 10
1:10:00 11
The calculated value for the AVG, STDEV, and PCTGOOD functions
includes the tag value at the lower interval boundary time and excludes the
tag value at the upper interval boundary time. For the example above, the
tag value "10" at time 1:09:00 is excluded in the function calculation,
therefore the calculated value for AVG is 4.5 and the calculated value for
STDEV is 2.872281.
The calculated value for the MIN, MAX and RANGE functions includes
the tag value of both the lower and upper interval boundary times. For the
example above, the calculated value for MIN is 1, the calculated value for
MAX is 11 and the calculated value for RANGE is 12.
Plot a Moving Average in a Trend
You can plot additional statistics in a trend using data sets derived from
FactoryTalk Historian tags. For example, you can plot both a tag and its