If an asset class has unique risk, it will exhibit variability in a rolling 3-year correlation analysis similar to Figure 2.

FORBES: Basics of Asset Allocation (Part 2 of 2)

Additionally, a 2007 meta-analysis found a correlation between increased coffee consumption and lower risk of liver cancer.

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Part of this analysis requires a correlation study to test if the asset class has unique risk.

FORBES: Basics of Asset Allocation (Part 2 of 2)