Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 267)

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 FactoryTalk Historian Summary Data Sets
FactoryTalk Historian Summary Data Sets enable you to use pre-
determined functions to retrieve aggregated FactoryTalk Historian
data for a tag.
 The AVG function calculates the average of the tag values for
each interval.
 The Count function is the sum of event count over the time range
when calculation basis is event-weighted, sum of event time
duration over the time range when calculation basis is time-
weighted.
 The MIN function selects the minimum of the tag values for each
interval. A timestamp associated with the minimum value is also
available.
 The MAX function selects the maximum of the tag values for
each interval. A timestamp associated with the maximum value is
also available.
 The PCTGOOD function determines the percentage of time for
each interval, when the tag’s archived values are good (that is
without errors, such as out of range errors or shutdown flags). It is
not applicable for digital tags.
 The PSTDEV function calculates the population or sample
standard deviation of two or more values.
 The RANGE function calculates the difference between the tag’s
maximum and minimum values for each interval.
 The STDEV function calculates the population Standard
Deviation of the tag values for each interval.
 The Total function is the total over the given time range.