Monthly Archives: May 2014

Understanding How Fund Performance Comparisons Overstate Returns

May 13, 2014

Every investor has, I hope, read the standard disclaimer on mutual fund and ETF performance documents that ‘past performance does not predict future performance,’ or other text to that effect. Still, when you read a fund company’s statement that ‘x% of our funds have out-performed their category average’ or that ‘x% of our funds are rated 4- and 5-star by Morningstar,’ this seems meaningful. Similarly, if you read that the average small value fund has returns ‘y’% per year over the last 10 years, this also seems significant. There is a major factor that is missing in many of these types of comparisons of fund performance, however, that tend to make active funds look better than they really are (as compared to low-cost index funds) as well as making a mutual fund family’s managers look more skillful than they might actually be.

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