Assessing Early Warning Systems: How Have they Worked in Practice?

Authors:
  • ABAndrew Berg
    Andrew Berg
  • EBEduardo Borensztein
    Eduardo Borensztein
  • CPCatherine A. Pattillo
    Catherine A. Pattillo

Abstract
Since 1999, the IMF's staff has been tracking several early-warning-system (EWS) models of currency crisis. The results have been mixed. One of the long-horizon models has performed well relative to pure guesswork and to available non-model-based forecasts, such as agency ratings and private analysts' currency crisis risk scores. The data do not speak clearly on the other long-horizon EWS model. The two short-horizon private sector models generally performed poorly.

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