priyanka.tayade

Time weighted Standard Deviation

Discussion created by priyanka.tayade on Sep 9, 2011
Latest reply on Oct 4, 2011 by Ahmad Fattahi

I am trying to calculate time weighted standard deviation on  PI data. I am using formula below.  My time weighted average result matches the PI summary average but not the standard deviation.

 

Is Pi using any different way for standard deviation calculations.

 

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