This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

Using the Information Ratio


Although originally called the "appraisal ratio" by Treynor and Black, the information ratio is the ratio of relative return to relative risk (known as "tracking error"). Whereas the Sharpe ratio looks at returns relative to a riskless asset, the information ratio is based on returns relative to a risky benchmark which is known colloquially as a "bogey." Given an asset or portfolio of assets with random returns designated by Asset and a benchmark with random returns designated by Benchmark, the information ratio has the form:

Mean(Asset − Benchmark) / Sigma (Asset − Benchmark)

Here Mean(Asset − Benchmark) is the mean of Asset minus Benchmark returns, and Sigma(Asset - Benchmark) is the standard deviation of Asset minus Benchmark returns. A higher information ratio is considered better than a lower information ratio. For more information, see inforatio.

Information Ratio

To calculate the information ratio using the example data, the mean return of the market series is used as the return of the benchmark. Thus, given asset return data and the riskless asset return, compute the information ratio with

load FundMarketCash 
Returns = tick2ret(TestData);
Benchmark = Returns(:,2);
InfoRatio = inforatio(Returns, Benchmark)

which gives the following result:

InfoRatio =
    0.0432       NaN   -0.0315

Since the market series has no risk relative to itself, the information ratio for the second series is undefined (which is represented as NaN in MATLAB® software). Its standard deviation of relative returns in the denominator is 0.

See Also

| | | | | | | |

Related Examples

Was this topic helpful?