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" ... If you are trying to calculate the correlation factor of each of your investments, it is important to note that correlation tends to be non-stationary and changes over time. During periods of market stress, the correlation between theoretically uncorrelated products may turn positive. What this means is that any worthwhile uncorrelated investment strategy must look to maintain an independent performance by trading on continually recurring market phenomena, such as bond auction cycles and index rebalancings, that take place reliably month after month, regardless of how the broader market is doing. Fortunately, there is a lot of academic literature that is available for investors to learn about this. ... "