The inefficiency term in stochastic frontier models is usually assumed to have positive skewness; but when this assumption is not met, efficiency scores are overestimated. Potential endogeneity of model regressors poses an additional empirical challenge and greatly hinders identification of...

We propose exible models for multivariate realized volatility dynamics which involve generalizations of the Box-Cox transform to the matrix case. The matrix Box-Cox model of realized covariances (MBC-RCov) is based on transformations of the covariance matrix eigenvalues, while for the Box-Cox...

This paper formulates dynamic density functions, based upon skewed-t and similar representations, to model and forecast electricity price spreads between different hours of the day. This supports an optimal day ahead storage and discharge schedule, and thereby facilitates a bidding strategy for...