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StdDev is the standard deviation over the time range given by
SStDev returns the sample standard deviation.The sample standard deviation of a sample x1, ... xn is equal to
SStDev(x1, x2 [, ... xn]) in PI Analytics takes arguments x1, ... xn
Arguments and a single array of same value type (integers and real numbers, time expressions, or time intervals)
If this is a one-off calculation you could you AF Explorer, right click on the attribute, Time Series
This can be programmatically achieved in AF SDK through PIPoint.Summaries method and specifying AFCalculationBasis as PopulationStdDev
Thank you very much for your reply.
Unfortunately I am using an older version of PI and I do not have access to the "recordedvalues" performance equation.
Thanks for clearing up which formula is used in the two different equations though!
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Also you can try this utility PI DataPipe Events Subscription and Data Access Utility using AF SDK - PIEventsNovo
You get the different summary/summaries calculations(event or time based) of one or more tags as follows without the need to write your own program in AF SDK.
That is literally everything I need. You are a life saver! Thank you so much!
<3 <3 <3