In sparse large-scale testing problems where the false discovery proportion (FDP) is highly variable, the false discovery exceedance (FDX) provides a valuable alternative to the widely used false discovery rate (FDR). We develop an empirical Bayes approach to controlling the FDX. We show that...

This dissertation studies the large-scale multiple testing problem from a compound decision theoretical view, and proposes a new class of powerful data-driven procedures that substantially outperform the traditional p -value based approaches. There are several important implications from my...

The auction rate bond market grew from inauspicious beginnings in 1985 to representing a significant fraction of the municipal bond market in 2007 with a total of 603 issuances that year raising more than $35 billion in capital. Since March of 2008 not a single auction rate bond has been issued....

We investigate the risk and return of a wide variety of trading strategies involving options on the S&P 500. We consider naked and covered positions, straddles, strangles, and calendar spreads, with different maturities and levels of moneyness. Overall, we ï¬nd that strategies involving short...

We calibrate a dynamic model of credit risk and analyze the relation between growth options and credit spreads. Our model features real and financing frictions, a technology with decreasing returns to scale, and endogenous investment options driven by both systematic and idiosyncratic shocks. We...

Risk management is the most widely-cited reason that non-financial corporations use derivatives. If hedging programs are effective, then firms using derivatives should have lower credit risk than those that do not. Surprisingly, we find that firms with derivative positions without a hedge...