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When you combine multiple, single-period arithmetic attributions across time, the attribution segment level effects do not sum to the total effects of the portfolio over the benchmark for the total time period. This is due to compounding over the periods. This problem is dealt with by introducing smoothing coefficients that adjust each of the values slightly to make the effects sum or multiply properly for the full period being analyzed. There are numerous algorithms that exist to achieve this goal.

For fixed income attribution, you can use the Menchero or Carino arithmetic algorithms or the Menchero geometric algorithm to link attribution effects over time without introducing distortions or unexplained residuals. You specify these options when you configure the Global Attribution Group field.



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