Sentiment analysis in annual Reports from Brazilian companies listed at the BM&FBovespa
We investigated the association between the tone of annual reports issued by a sample of listed Brazilian firms and market variables (abnormal returns, trading volume and price volatility). The tone was measured using sentiment analysis techniques (Liu et al., 2005; Liu, 2010). As in Loughran and McDonald (2011), we developed and used lists of positive, negative, litigious, uncertainty-related and modal words in Portuguese to assess the tone of annual reports. Using a sample of 829 annual reports from 1997 to 2009, we observed a weak association between the tone of annual reports and stock market variables in Brazil. Additionally, we considered a sub-sample prior to GAAP changes in Brazil (1997-2007) and our results are maintained. Contrary to other studies using data from the United States, we found that the tone of annual reports released by Brazilian firms is not conducive to estimating returns.
Keywords: sentiment analysis, textual sentiment, positive words, negative words, annual reports.
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