This study presents a hedge fund portfolio choice model for an investor facing ambiguity. In the empirical section, we measure ambiguity as the cross-sectional dispersion in Industrial Production growth and in stock market return forecasts, and we construct the systematic ambiguity factors from...

We reconsider the question of whether beta-centric hedge fund activity is predictive of superior performance. We construct a measure of overall beta activity of fund managers, Beta Activity, and find evidence that top beta active managers deliver superior long term out-of-sample performance...