Modelling talent – and tails

By Martin StewardMarch 2010 (Magazine)

We all know that finding alpha is tough. But managing a portfolio of alpha sources is also trickier than it seems. Many assume that a hedge fund manager’s idiosyncratic risk has a stable relationship with his beta exposures (which is unsatisfactory); and that idiosyncratic risk is normally-distributed and, by definition, non-correlated with other idiosyncratic risks (which is potentially disastrous). Very few have made significant progress beyond these assumptions, but it should come as no surprise that one of those few is fund of hedge funds Caliburn Capital Partners – because building portfolios of alpha is its raison d’être.