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Are you able to use AF analyses? We recommend those over the use of datasets for many reasons, including performance, functionality, scalability, and the calculation not being locked into that display but being available across the entire PI system.
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As @Kelsey Duffy suggested I would recommend AF analysis over datasets. You can create attributes and map output from analysis to attributes. If you are using PI vision then recommend PI table which has columns that calculate Average, Maximum, Minimum, StdDev,Range etc.
Another option in AF : Create child attribute and map to original PI Point(parent attribute) and in settings select by Time Range (Average, Total, Maximum, Minimum) and it will calculate based not the time period selected by the client.