This paper explores tests of the hypothesis that the tail thickness of a distribution is constant over time. Using Hill's conditional maximum likelihood estimator for the tail index of a distribution, tests of tail shape constancy are constructed that allow for an unknown breakpoint. The...

The authors' subject is estimation and inference concerning long-run economic equilibria in models with stochastic trends. An asymptotic theory is provided to analyze a menu of currently existing estimators of cointegrated systems. The authors study, in detail, the single-equation...

This paper provides a general framework which makes it possible to study the asymptotic behavior of FM regression in models with I(1) and I(0) regressors, models with unit roots, and models with only stationary regressors. This framework enables us to consider the use of FM regression in the...