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Add operators for unevenly spaced time series to PI Analysis

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Zumbach and Mueller developed operators (MA, MSD, DEV, Variance, correlation, ...) specifically for inhomogeneous time serious. These work great with PI snapshot values, are computationally much more efficient compared to the standard algorithms and have attractive properties for analytical applications:

 

http://www.thalesians.com/archive/public/academic/finance/papers/Zumbach_2000.pdf

or
https://www.nag.com/IndustryArticles/inhomogeneous_time_series.pdf

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