Motivation
1.The severity of the crises has motivated researchers to develop early warning systems in order to forestall similar crises. Such early warning systems typically involve some precise definition of a crisis and a mechanism for predicting it.
2.This paper studies exchange rate turmoil, they focus on episodes of extensive exchange rate changes, and they analyze which variables trigger the move from a tranquil period to a turbulent time.
3.Their modeling strategy relies on the empirical evidence that i) small exchange rate changes are associated with low volatility (ordinary regime) and large exchange rate movements go together with high volatility (turbulence), and ii) exchange rate volatility is not constant in the two regimes. This calls for a GARCH regime switching approach.