We introduce the realized co-range, a novel estimator of the daily covariance between asset returns based on intraday high-low price ranges. In an ideal world, the co-range is five times more efficient than the realized covariance, which uses cross-products of intraday returns, when sampling at...

The sum of squared intraday returns provides an unbiased and almost error-free measure of ex-post volatility. In this paper we develop a nonlinear Autoregressive Fractionally Integrated Moving Average (ARFIMA) model for realized volatility, which accommodates level shifts, day-of-the-week...

This paper investigates the merits of high-frequency intraday data when forming minimum variance portfolios and minimum tracking error portfolios with daily rebalancing from the individual constituents of the S&P 100 index. We focus on the issue of determining the optimal sampling frequency,...

Political risk relates to both the ability and the willingness of governments to repay debts. We find that bond prices only slowly adapt to changes in political risk. The expected bond returns for countries whose political risk ratings have improved are higher than those for countries whose...

In this paper we examine a momentum strategy based on residual stock returns. We find that residual momentum exhibits risk-adjusted profits that are about twice as large as those associated with total return momentum. Moreover, we find that the main arguments that have been put forward in the...