Two approaches for model-based clustering of categorical time series based on time- homogeneous first-order Markov chains are discussed. For Markov chain clustering the in- dividual transition probabilities are fixed to a group-specific transition matrix. In a new approach called Dirichlet...

We consider a new method to estimate causal effects when a treated unit suffers a shock or an intervention, such as a policy change, but there is not a readily available control group or counterfactual. We propose a two-step approach where in the first stage an artificial counterfactual is...

We study the relationship between the budget balance and the current account balance for European Union(EU) countries, using quarterly data from1995 to2020. Through the use of panel Granger causality tests and a panel SUR model, we conclude that the relationship is bi-directional for the EU...