Their study shows that due to inherent biases in the way hedge-fund databases compile results, the industry's returns have been about half as strong as they appear
http://finance.yahoo.com/news/buzzkill-profs-hedge-funds-half-145947680.html?l=1
http://finance.yahoo.com/news/buzzkill-profs-hedge-funds-half-145947680.html?l=1