This paper uses a Threshold Autoregressive (TAR) model with exogenous variables to explain a change in regime in Brazilian nominal interest rates. By using an indicator of currency crises the model tries to explain the difference in the dynamics of nominal interest rates during and out of a currency crises. The paper then compares the performance of the nonlinear model to a modified Taylor Rule adjusted to Brazilian interest rates, and shows that the former performs considerably better than the latter.A função de reação do Banco Central do Brasilé modelada via um modelo TAR (Limiar Auto-regressivo) para dar conta da mudança de regime na determinação da taxa nominal de juros. O modelo faz uso de um indicador de crises cambiais para explicar as distintas dinâmicas da taxa nominal de juros durante e fora das crises. O desempenho do modelo não-linearé significativamente melhor do que o de uma regra de Taylor ajustadaàs taxas de juros brasileiras, demonstrando o comportamento dual da função de reação do Banco Central do Brasil.
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