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Avaliando a Volatilidade Diária dos Ativos: a hora da negociação importa?

  • José Valentim Machado Vicente
  • Gustavo Silva Araújo
  • Paula Baião Fisher de Castro
  • Felipe Noronha Tavares

The aim of this study is to examine whether investors who trade daily but at different times have distinct perceptions about the risk of an asset. In order to capture the uncertainty faced by these investors, we define the volatility perceived by investors as the distribution of standard deviations of daily returns calculated from intraday prices collected randomly. We find that this distribution has a high degree of dispersion. This means that different investors may not share the same opinion regarding the variability of returns of the same asset. Moreover, the close-to-close volatility is often less than the median of the volatility distribution perceived by investors while the open-to-open volatility is greater than that statistic. From a practical point of view, our results indicate that volatilities estimated using traditional samples of daily returns (i.e., close-to-close and open-to-open returns) may not do a good job when used as input in financial models since they may not properly capture the risk investors are exposed.

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File URL: http://www.bcb.gov.br/pec/wps/port/wps297.pdf
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Paper provided by Central Bank of Brazil, Research Department in its series Working Papers Series with number 297.

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Date of creation: Nov 2012
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Handle: RePEc:bcb:wpaper:297
Contact details of provider: Web page: http://www.bcb.gov.br/?english

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