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The Importance of Correlations in Portfolio Selection
A third ETF that's very popular takes a minimum variance approach at the portfolio level. Do you think that this is a valid implementation of the low volatility phenomenon, or does the introduction of correlation confound the issue? Yeah. With this approach, you tend to give too much weight to noise, because correlations are also more difficult to estimate. If you use too much of it, it ruins the food, but some of it helps.