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Consider Correlation to Diversify

Chart of the Week for February 24-March 2, 2006

Chart of the rolling 12-month correlation between the S&P 500 Index and the Lehman Brothers Aggregate Bond Index

Correlation measures the extent to which the returns of two asset classes are related. A correlation of 1.0 (perfect positive correlation) means that the asset classes move in perfect tandem; when one has a positive return, so does the other, in the same magnitude. A correlation of -1.0 (perfect negative correlation) means that when one asset class has a negative return, the other has a positive return, essentially the absolute value of the negative return. In theory, an investor would want to hold a portfolio of assets that are negatively correlated to reduce the risk of loss. Sadly, asset classes with perfect negative correlation only exist in theory. Still, investors can reduce risk by selecting asset classes that are less than perfectly correlated.

An interesting aspect of correlations is that they change over time, as the chart above illustrates. Although patterns of stock and bond returns have become more similar in the past few months, the current rolling 12-month correlation is well below the 20-year average of +0.23. Note, however, that because stock/bond correlation is never a perfect 1.0, there is clearly a diversification benefit to holding each in a portfolio.

This illustration was compiled by information from outside sources. These companies are not affiliated with ICMA-RC. This information is being provided for educational purposes and is not intended to be construed as or relied upon as investment advice. ICMA-RC does not offer specific tax or legal advice. Individuals are advised to consider any new investment strategies carefully prior to implementing.

Investment information can change rapidly and the changes can be significant particularly in volatile markets. For this reason “as of”’ dates are provided for specific data where applicable. The information should not be considered current after the dates provided.

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The performance data quoted represents past performance. Past performance is no guarantee of future results. Investment returns and principal value will fluctuate, so that an investor's shares, when redeemed, may be worth more or less than their original cost. Current performance may be lower or higher than the performance data illustrated. For performance data current to the most recent month end, contact ICMA-RC Services, LLC by calling 800-669-7400 or by writing to 777 North Capitol Street, NE, Washington, DC 20002-4240. Para asistencia en Español llame al 800-669-8216. Performance data current to the most recent quarter end is available by visiting www.icmarc.org.

 
February 24, 2006