Elias Tzavalis

Abstract: In this paper we suggest a Bayesian approach for inferring stationary autoregressive models allowing for possible structural changes (known as breaks) in both the mean and the error variance of economic series occuring at unknown times Efficient Bayesian inference for the unknown number and positions of the structural breaks is performed by using filtering recursions similar to those of the forward-backward algorithm A Bayesian approach to unit root testing is also proposed, based on the comparison of stationary autoregressive models with multiple breaks to their counterpart unit root models In the Bayesian setting, the unknown initial conditions are treated as random variables, which is particularly appropriate in unit root testing Simulation experiments are conducted with the aim to assess the performance of the suggested inferential procedure, as well as to investigate if the Bayesian model comparison approach can distinguish unit root models from stationary autoregressive models with multiple structural breaks in the parameters The proposed method is applied to key economic series with the aim to investigate whether they are subject to shifts in the mean and/or the error variance The latter has recently received an economic policy interest as improved monetary policies have also as a target to reduce the volatility of economic series

TL;DR: In this paper, a discrete-time pricing model for European options where the log-return of the underlying asset is subject to discontinuous regime shifts in its mean and/or volatility which follow a Markov chain is developed.

TL;DR: In this article, the authors introduce the XBunitroot command in Stata, which implements the panel data unit root tests developed by Karavias and Tzavalis (2014) and can be applied to panels with small or large time series dimensions.

TL;DR: In this article, the authors show that the term spread between long and short rates fails to forecast future movements of long term rates although its forecasts of future short term rates are in the correct direction.