Information Ratio - IR

A ratio of portfolio returns above the returns of a benchmark to the volatility of those returns. The information ratio measures a portfolio manager's ability to generate excess returns relative to a benchmark, but also attempts to identify the consistency of the investor. This ratio will identify if a manager has beaten the benchmark by a lot in a few months or a little every month. The higher the IR the more consistent a manager is and consistency is an ideal trait.



Rp = Return of the portfolio
Ri = Return of the index or benchmark
Sp-i = Tracking error

A high IR can be achieved by having a high return in the portfolio, a low return of the index and a low tracking error.

For example:
Manager A might have returns of 13% and a tracking error of 8%
Manager B has returns of 8% and tracking error of 4.5%
The index has returns of -1.5%
Manager A's IR = [13-]/8 = 1.81
Manager B's IR = [8-]/4.5 = 2.11

Manager B had lower returns but a better IR. A high ratio means a manager can achieve higher returns more efficiently than one with a low ratio by taking on additional risk. Additional risk could be achieved through leveraging.





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