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Estimating the COP Exchange Rate Volatility Smile and the Market Effect of Central Bank Interventions: A CHARN Approach

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  • Juan Manuel Julio

    ()

  • Norberto Rodríguez

    ()

  • Héctor Manuel Zárate

    ()

Abstract

In this paper we estimated a volatility model for COP/US under two different samples, one containing the information before the “discretional interventions” started, and the other using the whole sample. We use a nonparametric approach to estimate the mean and “volatility smile” return functions using daily data. For the pre-interventions sample, we found a nonlinear expected return function and, surprisingly, a nonsymmetric “volatility smile”. These lack of linearity and symmetry are related to absolute returns above 1,5% and 1,0%, respectively. We also found that the “discretional interventions” did not shift the mean response function, but moved the expected returns along the line towards the required levels. In contrast, the “volatility smile” tends to increase in a non-symmetric way after accounting for “discretional interventions”. The Sep/29/2004 announcement does not seem to have had any effect on the expected conditional mean or variance functions, but the Dec/17/2004 announcement seems to be related to non-symmetric effects on the volatility smile. We concluded that the announcement of discretional intervention by the monetary authority was more efficient when time and amount were unannounced.

Suggested Citation

  • Juan Manuel Julio & Norberto Rodríguez & Héctor Manuel Zárate, 2005. "Estimating the COP Exchange Rate Volatility Smile and the Market Effect of Central Bank Interventions: A CHARN Approach," BORRADORES DE ECONOMIA 002605, BANCO DE LA REPÚBLICA.
  • Handle: RePEc:col:000094:002605
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    References listed on IDEAS

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    1. Beine, Michel & Laurent, Sebastien, 2003. "Central bank interventions and jumps in double long memory models of daily exchange rates," Journal of Empirical Finance, Elsevier, vol. 10(5), pages 641-660, December.
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    4. Norberto Rodríguez & Patricia Siado, 2003. "Un Pronóstico No Paramétrico De La Inflación Colombiana," BORRADORES DE ECONOMIA 003691, BANCO DE LA REPÚBLICA.
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    6. Kim, Suk-Joong & Kortian, Tro & Sheen, Jeffrey, 2000. "Central bank intervention and exchange rate volatility -- Australian evidence," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 10(3-4), pages 381-405, December.
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    11. P. BOSSAERTS & C. HAFNER & Wolfgang HÄRDLE, 1996. "Foreign Exchange Rates Have Surprising Volatility," SFB 373 Discussion Papers 1996,68, Humboldt University of Berlin, Interdisciplinary Research Project 373: Quantification and Simulation of Economic Processes.
    12. Bossaerts, Peter & Hillion, Pierre, 1991. "Market Microstructure Effects of Government Intervention in the Foreign Exchange Market," Review of Financial Studies, Society for Financial Studies, vol. 4(3), pages 513-541.
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    Keywords

    Volatility Smile;

    JEL classification:

    • C14 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Semiparametric and Nonparametric Methods: General

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